Perhaps you should try some spelling variations:
"modified over estimation algorithms" » "modified over optimization algorithms", "modified over optimisation algorithm", "modified over approximation algorithms", "modified cover estimations algorithms", "modified pose estimation algorithms", "modified sphere estimation algorithms", "modified near estimation algorithms", "modified orca estimation algorithms"
"modified allocation estimation algorithm" » "modified allocation optimization algorithm", "modified motion estimation algorithm"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified over estimation algorithms") or ("modified allocation estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified over estimation algorithms") OR ("modified allocation estimation algorithm")).
• Removing quotes may allow a broader search: (( modified over estimation algorithms ) or ( modified allocation estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified over estimation algorithms") or ("modified allocation estimation algorithm"))*.