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 bayesian optimisation algorithm" » "modified bayesian optimization algorithms", "modified bayesian estimation algorithm", "modified bayesian estimation algorithms", "modified bayesian optimization algorithm"

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