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