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

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

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