Perhaps you should try some spelling variations:
"modified _ convolution algorithms" » "modified _ evolution algorithm", "modified _ solution algorithm"
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified _ convolution algorithms") or ("modified multiobjective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified _ convolution algorithms") OR ("modified multiobjective optimization algorithm"))*.
• Removing quotes may allow a broader search: (( modified _ convolution algorithms ) or ( modified multiobjective optimization algorithm ))*.