Tip No. 1:
You can search for an exact word or phrase by enclosing it into quotation marks ".
If the word is not included in quotation marks all the inflectional forms of that words will be returned. For example if you search for aids (without quotation marks) the system returns also "HIV".

Tip No. 2:
You can restrict searches by using Boolean operators AND, OR, and NOT in the search input box (must be in capital letter).

Example: breast AND cancer

You can also use the dash sign to exlude a word (equivalent of using NOT)

Esample: aids -cancer
(The above search returns all the documents containing aids but not the word cancer)

Tip No. 3:
Use the < > signs to search for documents containing words which are a close proximity.

Example:

this search returns results where these words are in a close position as in the following example:

"...the woman with breast cancer is..."

but excludes documents where those words are not close enough each other as the following example:

"…A Woman's Influence to Choose Mastectomy as Treatment for Breast Cancer..."

Tip No. 4:
You can use an asterisk (*) as a wildcard character. This searches for words that begin with the specified word as prefix.

Example: meta* matches metastatic, metabolite, etc.

Tip No. 5:
You can use a tilde sign (~) as a wildcard character.
This returns all the thesaurus forms of the searched word

Syntax example: ~aids

Tip No. 6:
Use parentheses to create nested searches.

Example: (cancer AND breast) OR (cancer AND colon)

Notes that the AND operator takes precedence over the OR operator in queries.

For example, considering the query breast cancer or woman. This is evaluated by the Search engine as:

((Breast AND cancer) OR woman)

You can change the order by using the parentheses so that the OR operator is evaluated first by entering:

Breast AND (cancer OR woman) => (OR operator has precedence)

instead of

Breast AND cancer OR woman => (AND operator has precedence by default)