Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ optimized algorithms", "_ optimizer algorithms"
"_ estimation algorithms" » "_ optimisation algorithm", "_ approximation algorithms"
"qoe estimation algorithm" » "pose estimation algorithm", "cover estimations algorithm", "qoe optimization 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: (("_ optimization algorithms") OR ((("_ estimation algorithms") OR ("qoe estimation algorithm"))))~.
• Removing quotes may allow a broader search: (( _ optimization algorithms ) or ((( _ estimation algorithms ) or ( qoe estimation algorithm ))))~.
• Adding a wildcard symbol may retrieve word variants: (("_ optimization algorithms") or ((("_ estimation algorithms") or ("qoe estimation algorithm"))))*.