Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"model using search algorithm" » "model using source algorithm", "model using egarch algorithm", "model nursing research algorithm", "model using servo algorithm", "code using search algorithm", "models nursing search algorithm", "powder using search 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 multiobjective optimization algorithms") or ("model using search algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithms") OR ("model using search algorithm")).
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithms ) or ( model using search algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithms") or ("model using search algorithm"))*.