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