Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithm", "_ optimizer algorithms"
"qoe estimation algorithms" » "qoe estimation algorithm", "qoe optimisation algorithm", "qoe approximation algorithms", "pose estimation algorithms", "_ estimation algorithms", "cover estimations algorithms"
"_ optimized algorithms" » "_ optimized algorithm", "_ 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: (("qoe estimation algorithms") OR ((("_ optimization algorithms") OR ("_ optimized algorithms"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"qoe estimation algorithms\") or (((\"_ optimization algorithms\") OR (\"_ optimized algorithms\"))))~".
• Removing quotes may allow a broader search: (( qoe estimation algorithms ) or ((( _ optimization algorithms ) OR ( _ optimized algorithms ))))~.
• Adding a wildcard symbol may retrieve word variants: (("qoe estimation algorithms") or ((("_ optimization algorithms") OR ("_ optimized algorithms"))))*.