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