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