Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"model using servo algorithm" » "model using search algorithm", "model using source algorithm", "code using servo algorithm", "models nursing servo algorithm", "powder using servo algorithm"

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 algorithm") or ("model using servo algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithm") OR ("model using servo algorithm")).
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) or ( model using servo algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithm") or ("model using servo algorithm"))*.