Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified total approximation algorithms" » "modified one approximation algorithms", "modified time approximation algorithms", "modified rough approximations algorithms", "modified thermal approximation algorithms", "modified ti6al4v approximation algorithms"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified total approximation algorithms") or ("modified multiobjective estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified total approximation algorithms") OR ("modified multiobjective estimation algorithm"))*.
• Removing quotes may allow a broader search: (( modified total approximation algorithms ) or ( modified multiobjective estimation algorithm ))*.