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