| Adjacency: Multiple words are searched together as one phrase.
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- world health organization
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| Wildcards: Words may be right-hand truncated using an asterisk. '*' for 1-5 characters, '**' for open-ended truncation, '?' to replace a single character anywhere within a word.
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| Boolean Operators: Use "and" or "or" to specify multiple words in any field, any order. Use "and not" to exclude words.
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- nuclear and medicine
- gene** not general
- (myocardial infarction or cardiac arrest) and (treatment and not drugs)
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| Proximity Operators: Use "near" to specify words close to each other, in any order.
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