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