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