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