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 caging optimization algorithm" » "modified caging optimization algorithms", "modified caging optimisation algorithm", "modified caging estimation algorithm", "modified staffing optimization algorithm"

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 caging optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified adam approximation algorithm") OR ("modified caging optimization algorithm")).
• Removing quotes may allow a broader search: (( modified adam approximation algorithm ) or ( modified caging optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified adam approximation algorithm") or ("modified caging optimization algorithm"))*.