Perhaps you should try some spelling variations:
"german scientific ontology flights" » "german centric ontology flights", "german scientific outlook flights", "german scientific methodology flights", "can scientific ontology flights"
"berlin scientific belief flights" » "borodin scientific belief flights", "version scientific belief flights", "bazin scientific belief flights", "berlin scientific basis flights", "berlin scientific bases flights", "berlin scientific base flights", "berlin scientific belief insights"
"german specific ontology flights" » "germany specific ontology flights", "german specificity ontology flights", "germline specific ontology 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: (("berlin scientific belief flights") OR ((("german scientific ontology flights") OR ("german specific ontology flights")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"berlin scientific belief flights\") or (((\"german scientific ontology flights\") OR (\"german specific ontology flights\"))))".
• Removing quotes may allow a broader search: (( berlin scientific belief flights ) or ((( german scientific ontology flights ) OR ( german specific ontology flights )))).
• Adding a wildcard symbol may retrieve word variants: (("berlin scientific belief flights") or ((("german scientific ontology flights") OR ("german specific ontology flights"))))*.