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