Perhaps you should try some spelling variations:
"modified one approximation algorithm" » "modified one approximation algorithms", "modified time approximation algorithm", "modified _ approximation algorithm", "modified rough approximations algorithm", "modified male approximation algorithm", "modified near approximation algorithm", "modified orca approximation algorithm"
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective 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 one approximation algorithm") or ("modified objective allocation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified one approximation algorithm") OR ("modified objective allocation algorithms")).
• Removing quotes may allow a broader search: (( modified one approximation algorithm ) or ( modified objective allocation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified one approximation algorithm") or ("modified objective allocation algorithms"))*.