Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithm", "modified allocation optimized algorithms"
"modified location estimation algorithms" » "modified location estimation algorithm", "modified location optimisation algorithm", "modified location approximation algorithms", "modified motion estimation algorithms", "modified carbon estimation algorithms"

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