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