| To specify | Enter | Example |
|---|---|---|
| Multiple terms, all terms required (AND) | [term1] [term2] Or [term1] and [term2] A space between terms is treated as an and. |
transportation safety |
| Multiple terms, at least one term required (OR) | [term1] or [term2] | radiography or radiology |
| One or more terms that must not be found (NOT) | [term1] [term2] not [term3] Or [term1] or [term2] or [term3] |
college education not secondary |
| One or more groups of terms combined with other terms (parentheses) | [term1] ([term2] or [term3]) [term1] or ([term2] or [term3]) [term1] or ([term2] [term3]) |
education (college or university) graduate or (college or university) graduate or (college university) |