Perhaps you should try some spelling variations:
"modified multiobjective approximation algorithms" » "modified multiobjective optimization algorithms"
"modified near optimisation algorithm" » "modified near optimization algorithms", "modified near estimation algorithm", "modified near estimation algorithms", "modified _ optimisation algorithm", "modified network optimization algorithm", "modified seird optimisation algorithm", "modified adam optimisation algorithm"

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

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