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 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"

You may be able to get more results by adjusting your search query.

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