Perhaps you should try some spelling variations:
"modified df evolution algorithms" » "modified df evolution algorithm", "modified df convolution algorithms", "modified df solution algorithm", "modified _ evolution algorithms", "modified co evolution algorithms", "modified adam evolution algorithms", "modified bi1 evolution algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one 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 df evolution algorithms") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df evolution algorithms") OR ("modified notion approximation algorithms")).
• Removing quotes may allow a broader search: (( modified df evolution algorithms ) or ( modified notion approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified df evolution algorithms") or ("modified notion approximation algorithms"))*.