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- If you are trying to use Boolean operators, they must be ALL CAPS: (((("unmanned arterial vehicles") OR ("unmanned arial vehicles"))) OR ("unmanned aerial vehicles")).
- The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"unmanned arterial vehicles\") OR (\"unmanned arial vehicles\"))) or (\"unmanned aerial vehicles\"))".
- Removing quotes may allow a broader search: (((( unmanned arterial vehicles ) OR ( unmanned arial vehicles ))) or ( unmanned aerial vehicles )).
- Adding a wildcard symbol may retrieve word variants: (((("unmanned arterial vehicles") OR ("unmanned arial vehicles"))) or ("unmanned aerial vehicles"))*.