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 method algorithm" » "machine learning method algorithm", "enabling learning method algorithm", "mapping learning mom algorithm", "mapping learning methods algorithm", "mapping graining methods algorithm", "mapping learning emotion algorithm"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective optimizer algorithms\") OR (\"mapping learning method algorithm\"))~".
• Removing quotes may allow a broader search: (( modified objective optimizer algorithms ) OR ( mapping learning method algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimizer algorithms") OR ("mapping learning method algorithm"))*.