Perhaps you should try some spelling variations:
"qoe optimization algorithm" » "qoe optimization algorithms", "qoe optimisation algorithm", "qoe optimized algorithm", "game optimization algorithm", "_ optimization algorithm", "stage optimization algorithm"
"_ estimation algorithms" » "_ optimization algorithms", "_ optimisation algorithm", "_ approximation algorithms"
"qoe estimation algorithm" » "pose estimation algorithm", "cover estimations algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("_ estimation algorithms") or ((("qoe optimization algorithm") or ("qoe estimation algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ estimation algorithms") OR ((("qoe optimization algorithm") OR ("qoe estimation algorithm")))).
• Removing quotes may allow a broader search: (( _ estimation algorithms ) or ((( qoe optimization algorithm ) or ( qoe estimation algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("_ estimation algorithms") or ((("qoe optimization algorithm") or ("qoe estimation algorithm"))))*.