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 evolution algorithm" » "mapping learning solution algorithm", "mapping learning evolutionary algorithm", "mapping learning convolution algorithms", "mapping learning convolution algorithm", "mapping learning emotion algorithm", "machine learning evolution algorithm", "enabling learning evolution 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: (("mapping learning evolution algorithm") or ("modified objective optimizer algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mapping learning evolution algorithm") OR ("modified objective optimizer algorithms")).
• Removing quotes may allow a broader search: (( mapping learning evolution algorithm ) or ( modified objective optimizer algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("mapping learning evolution algorithm") or ("modified objective optimizer algorithms"))*.