Perhaps you should try some spelling variations:
"modified objective optimisation algorithm" » "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithm"
"modified changing estimation algorithms" » "modified changing estimation algorithm", "modified changing optimization algorithms", "modified changing approximation algorithms", "modified channel estimation algorithms", "modified charging station algorithms", "modified caging estimation 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 changing estimation algorithms") or ("modified objective optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified changing estimation algorithms") OR ("modified objective optimisation algorithm")).
• Removing quotes may allow a broader search: (( modified changing estimation algorithms ) or ( modified objective optimisation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified changing estimation algorithms") or ("modified objective optimisation algorithm"))*.