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