Enclose your specific phrase in quotes.
Example: "organ transplantation"
Include Specific Words
Define sets of words that must all be present to return a result
Example: become + volunteer
Exclude Specific Words:
Example: Neuroscience -pediatric
Similar Words and Synonyms:
Include similar and synonymous words in your search with the "~" character.
Example: cancer ~treatment
Specific Document Types:
Example: "brain injury" filetype:pdf
This OR That:
Example: asthma OR allergy