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