Perhaps you should try some spelling variations:
"modified choosing optimizer algorithm" » "modified choosing optimizer algorithms", "modified choosing optimized algorithm", "modified choosing optimized algorithms", "modified caging optimizer algorithm"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male 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 time approximation algorithms") OR ("modified choosing optimizer algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified time approximation algorithms\") OR (\"modified choosing optimizer algorithm\"))".
• Removing quotes may allow a broader search: (( modified time approximation algorithms ) OR ( modified choosing optimizer algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified time approximation algorithms") OR ("modified choosing optimizer algorithm"))*.