MPG.eBooks - Search Results - (((("unmanned arterial vehicles") or ((("unmanned arial vehicles") OR ("unmanned marine vehicles"))))) or ("unmanned aerial vehicles"))

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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 marine 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 marine vehicles\"))))) or (\"unmanned aerial vehicles\"))".
Removing quotes may allow a broader search: (((( unmanned arterial vehicles ) or ((( unmanned arial vehicles ) OR ( unmanned marine vehicles ))))) or ( unmanned aerial vehicles )).
Adding a wildcard symbol may retrieve word variants: (((("unmanned arterial vehicles") or ((("unmanned arial vehicles") OR ("unmanned marine vehicles"))))) or ("unmanned aerial vehicles"))*.