Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"
"machinery using servo algorithm" » "machines using servo algorithm", "machinery using search algorithm", "machinery using source algorithm"

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

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