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