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