Perhaps you should try some spelling variations:
scientific exploration » scientific explanation, scientific collaboration, scientific information
scientific application » scientific applications, scientific publications, scientific explanation
american voyages » american villages, african voyagers, american images
aerial voyages » aerial voyage, aerial images

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( european AND ((american voyages) OR (aerial voyages)) of scientific exploration ) OR ( european AND ((american voyages) OR (aerial voyages)) of scientific application )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( european and ((american voyages) OR (aerial voyages)) of scientific exploration ) or ( european and ((american voyages) OR (aerial voyages)) of scientific application ))".
• Adding a wildcard symbol may retrieve word variants: (( european and ((american voyages) OR (aerial voyages)) of scientific exploration ) or ( european and ((american voyages) OR (aerial voyages)) of scientific application ))*.