By default, all searches are OR searches and you don't need to type in the OR operator in between the keywords.
This means when you search on one or more keywords, the results show publications that match any of
your keywords. To search for publications that contain one of several words,
you may include OR between the words, but you don’t have to, since OR is the default.
Example: secondhand OR smoke OR children (same as simply entering secondhand smoke children).
Result: The system will return publications that contain secondhand, smoke, or children.
To further narrow your search, you can search for publications that contain all search terms
by including AND between the terms. The results show publications that contain all the search terms,
and unlike Exact Match (described later), the order of your search terms does not matter.
Example: secondhand AND smoke AND children
Result: The system will return only publications that contain all three words.
To narrow your search even further, use quotes to search for an exact word or set of words.
Example: "the health consequences of smoking"
Result: The system will return publications that contain the exact phrase,
and the words in the phrase must occur in the order specified.
For the example above, the system will not return a publication that contains the phrase “the health
consequences of vaping and smoking” since it is not an exact match.
You can widen your search by entering part of a keyword,
for example, smok, and the system returns all the publications
that contain “smok”, i.e. “smokeless”, “smokers”, “smoking”, etc.
PCOS ignores stop words, which are commonly occurring words and numbers
that are omitted when the search is processed (for example: the, for, a, an).
Ignoring these stop words helps with the speed of the search.
Note: If you want to include stop words in a search use Exact Match.
Widening your Search
A wide search encompasses a wide range of publications.
Use this technique when your original search did not yield any results or if you want
a longer list of results.
To widen your search, follow these tips:
|Type only one word in the Search field
||Keyword = pregnancy
||The system displays publications containing the word pregnancy
|Type a part of the word (partial search)
||Keywords = smok
||The system displays publications containing the words smokeless, smoker, smoking, etc.
Narrowing Your Search
Use a narrow search if you have a specific set of criteria to meet,
or when the original search displayed too many publications in the results.
The more search criteria you enter, the narrower your search will be, and the less
the number of results that will be displayed.
To narrow your search, follow these tips:
|Type several keywords in the Search field separate the keywords with AND
||Keywords = surgeon AND general
||The system displays publications containing the words surgeon AND general in any order.
|Type several keywords in the Search field and include the keywords in quotes
||Keywords = “surgeon general”
||The system displays publications containing the words surgeon general in the specified order.