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