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