Perhaps you should try some spelling variations:
"qoe optimization algorithm" » "qoe optimization algorithms", "qoe optimisation algorithm", "qoe estimation algorithm", "game optimization algorithm", "_ optimization algorithm", "stage optimization algorithm"
"_ optimizer algorithms" » "_ optimized algorithms", "_ optimization algorithms", "_ optimize algorithms", "_ optimise algorithms"
"done optimized algorithm" » "done optimized algorithms", "dong optimized algorithm", "one optimized algorithm", "don optimized algorithm"

Try widening your search to All Fields.

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