Perhaps you should try some spelling variations:
"modified orca approximation algorithm" » "modified orca approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified time approximation algorithm"
"modified based optimisation algorithm" » "modified based optimization algorithms", "modified based estimation algorithm", "modified based estimation algorithms", "modified game optimization algorithm", "modified male optimisation algorithm"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified based optimisation algorithm") OR ("modified orca approximation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified based optimisation algorithm\") OR (\"modified orca approximation algorithm\"))".
• Removing quotes may allow a broader search: (( modified based optimisation algorithm ) OR ( modified orca approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified based optimisation algorithm") OR ("modified orca approximation algorithm"))*.