Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"mobile learning methods algorithm" » "mobile nursing methods algorithm", "machine learning methods algorithm"

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 methods algorithm") or ("modified multiobjective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mobile learning methods algorithm") OR ("modified multiobjective optimization algorithms"))*.
• Removing quotes may allow a broader search: (( mobile learning methods algorithm ) or ( modified multiobjective optimization algorithms ))*.