Perhaps you should try some spelling variations:
26 engineering » 16 engineering, line engineering
6 engineering » line engineering
fff materials » ff materials, mof materials, phf materials
2f material » f material, ff material, auf material
2f bisacsh » a bisacsh, life bisacsh

Try widening your search to All Fields.

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: %22technology %((26 engineering) OR (6 engineering)) %((2f material) OR (fff materials)) science %2f bisacsh%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22technology %((26 engineering) OR (6 engineering)) %((2f material) or (fff materials)) science %2f bisacsh%22".
• Adding a wildcard symbol may retrieve word variants: %22technology %((26 engineering) OR (6 engineering)) %((2f material) or (fff materials)) science %2f bisacsh%22*.