Perhaps you should try some spelling variations:
"modified allocation estimation algorithms" » "modified allocation estimation algorithm", "modified allocation optimization algorithms", "modified allocation optimisation algorithm", "modified motion estimation algorithms"
"modified changing optimizer algorithms" » "modified changing optimized algorithms", "modified changing optimized algorithm", "modified changing optimization algorithms", "modified choosing optimizer algorithms", "modified caging optimizer algorithms"

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 changing optimizer algorithms") OR ("modified allocation estimation algorithms"))~.
• Removing quotes may allow a broader search: (( modified changing optimizer algorithms ) or ( modified allocation estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified changing optimizer algorithms") or ("modified allocation estimation algorithms"))*.