Perhaps you should try some spelling variations:
"stromungsmechanik , instabilities , lehrbuch" » "stromungsmechanik , instability , lehrbuch"
"stromungsmechanik , disabilities , lehrbuch" » "stromungsmechanik , capabilities , lehrbuch", "stromungsmechanik , disability , lehrbuch"

Try widening your search to All Fields.

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"stromungsmechanik , instabilities , lehrbuch\") OR (\"stromungsmechanik , disabilities , lehrbuch\"))".
• Removing quotes may allow a broader search: (( stromungsmechanik , instabilities , lehrbuch ) OR ( stromungsmechanik , disabilities , lehrbuch )).
• Adding a wildcard symbol may retrieve word variants: (("stromungsmechanik , instabilities , lehrbuch") OR ("stromungsmechanik , disabilities , lehrbuch"))*.