Perhaps you should try some spelling variations:
"extending scientific alien flights" » "attending scientific alien flights", "expanding scientific alien flights", "extended scientific alien flights", "extending scientific patient flights", "extending scientific belief flights", "extending scientific action flights", "extending scientific air flights", "extending scientific line flights"
"german specific ontology flights" » "germany specific ontology flights", "german specificity ontology flights", "germline specific ontology flights", "german specific cytology flights"

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: (("extending scientific alien flights") OR ("german specific ontology flights")).
• Removing quotes may allow a broader search: (( extending scientific alien flights ) or ( german specific ontology flights )).
• Adding a wildcard symbol may retrieve word variants: (("extending scientific alien flights") or ("german specific ontology flights"))*.