Perhaps you should try some spelling variations:
"modified objective predators algorithm" » "modified objective predation algorithm"
"modified one approximation algorithms" » "modified time approximation algorithms", "modified _ approximation algorithms", "modified rough approximations algorithms", "modified male approximation algorithms", "modified near approximation algorithms", "modified orca 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 one approximation algorithms") OR ("modified objective predators algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified one approximation algorithms\") OR (\"modified objective predators algorithm\"))".
• Removing quotes may allow a broader search: (( modified one approximation algorithms ) OR ( modified objective predators algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified one approximation algorithms") OR ("modified objective predators algorithm"))*.