Perhaps you should try some spelling variations:
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithm", "modified objective optimized algorithms", "modified multiobjective optimization 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 objective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified location estimation algorithms") OR ("modified objective optimization algorithms")).
• Removing quotes may allow a broader search: (( modified location estimation algorithms ) or ( modified objective optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified location estimation algorithms") or ("modified objective optimization algorithms"))*.