Searches can use "boolean" logic:

Prefixing a search term with a "+" denotes boolean "AND" operator.
Prefixing a search term with a "-" denotes boolean "AND NOT" operator.
Absence of a prefix is interpreted as "OR" operator.

Examples: ("Search term" => Logical interpretation)
"computing DNA" => "computing" OR "DNA"
"+computing +DNA" => "computing" AND "DNA"
"+computing -DNA" => "computing" AND NOT "DNA"

Wildcard "*" searches are also valid, but only at the end of a word.

"*" is interpreted as one or more characters.

Example:
"comput* +DNA" => "comput*" AND "DNA"

Phrases can be enclosed in double-quotes (")

Example:
""mass spec*" +proteomics" => "mass spec*" AND "proteomics"

All searches are case-insensitive.