Perhaps you should try some spelling variations:
"modified multiobjective optimized algorithm" » "modified multiobjective optimization algorithm", "modified multiobjective optimized algorithms", "modified multiobjective optimizer algorithms"
"modified ti6al4v approximation algorithms" » "modified time approximation algorithms"

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 ti6al4v approximation algorithms") or ("modified multiobjective optimized algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified ti6al4v approximation algorithms") OR ("modified multiobjective optimized algorithm")).
• Removing quotes may allow a broader search: (( modified ti6al4v approximation algorithms ) or ( modified multiobjective optimized algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified ti6al4v approximation algorithms") or ("modified multiobjective optimized algorithm"))*.