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