Perhaps you should try some spelling variations:
recognizing strong » recognizing strengths, recognizing actions, recognizing action
recognizing string » recognizing standing, recognizing seizing, recognizing using
springer kremser » springers grosser, springer brenden, springer einer
springen eine » springer eine, springer einer, bringen eine

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: ((springer kremser) OR (springen eine)), ((recognizing string) OR (recognizing strong)) ph.d. research.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((springer kremser) or (springen eine)), ((recognizing string) OR (recognizing strong)) ph.d. research".
• Adding a wildcard symbol may retrieve word variants: ((springer kremser) or (springen eine)), ((recognizing string) OR (recognizing strong)) ph.d. research*.