Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithm", "modified allocation optimized algorithms", "modified location optimization algorithms"
"modified aging estimation algorithms" » "modified aging estimation algorithm", "modified aging optimisation algorithm", "modified aging approximation algorithms", "modified lighting estimation algorithms", "modified risk estimation algorithms", "modified caging estimation 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 aging estimation algorithms") OR ("modified allocation optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified aging estimation algorithms ) or ( modified allocation optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified aging estimation algorithms") or ("modified allocation optimization algorithms"))*.