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