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"
"modified oxygen evolution algorithm" » "modified oxygen solution algorithm", "modified oxygen evolutionary algorithm", "modified oxygen convolution 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 oxygen evolution algorithm") or ("modified multiobjective optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified oxygen evolution algorithm") OR ("modified multiobjective optimisation algorithm")).
• Removing quotes may allow a broader search: (( modified oxygen evolution algorithm ) or ( modified multiobjective optimisation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified oxygen evolution algorithm") or ("modified multiobjective optimisation algorithm"))*.