Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithms", "_ optimized algorithms", "_ optimisation algorithms", "_ estimation algorithmss"
"_ optimization algorithm" » "_ optimisation algorithm", "_ estimation algorithms", "_ optimized algorithm"
"qoe estimation algorithm" » "pose estimation algorithm", "_ 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: (("qoe estimation algorithm") or ((("_ optimization algorithm") or ("_ optimization algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("qoe estimation algorithm") OR ((("_ optimization algorithm") OR ("_ optimization algorithms")))).
• Removing quotes may allow a broader search: (( qoe estimation algorithm ) or ((( _ optimization algorithm ) or ( _ optimization algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("qoe estimation algorithm") or ((("_ optimization algorithm") or ("_ optimization algorithms"))))*.