Perhaps you should try some spelling variations:
"modified make optimization algorithms" » "modified make optimisation algorithm", "modified make estimation algorithms", "modified make estimation algorithm", "modified market optimization algorithms", "modified game optimization algorithms", "modified stage optimization algorithms", "modified male optimization algorithms"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male approximation algorithms"

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