- You can create your own Boolean phrases with any level of parentheses. This will
make it possible for you to specify the exact meaning of your search phrase.
- Only the search terms can be specified in your Boolean phrase; i.e., year of publication
and section can only be specified in the drop down lists.
- Order of precedence: Parentheses, NOT, AND, OR.
- If you enter “genentech OR amgen AND cancer”, then the logical result will be: “genentech
OR (amgen AND cancer)”, because the AND operator is evaluated before the OR. Similarly,
if you enter “cancer AND amgen OR genentech”, the result will be the same as above
for the same reason.
- You can force a desired logic by using parentheses. For example, if you want to
find what Genentech and Amgen are doing in cancer, you can enter “(genentech OR
amgen) AND cancer”.
Note Do not use {curly} or [square] brackets - use only
(parentheses).
The table shows several examples of natural language searches and their Boolean
implementations:
|
Normal English
|
Boolean Phrase
|
|
All articles about Amgen and cancer, and also all article about Genentech and cancer.
|
(amgen AND cancer) OR (genentech AND cancer)
|
|
All articles about Amgen and cancer, and also all articles about Genentech.
|
(cancer AND amgen) OR genentech
|
|
All articles with the words "amyloid" and "immunization", but without the term "42-amino"
|
(amyloid AND immunization) NOT 42-amino
|
|
All articles that are about Amgen and Genentech, but NOT about cancer.
|
(amgen AND genentech) NOT cancer
|
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