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