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

Try widening your search to All Fields.

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