Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithms", "_ estimation algorithm"
"qoe optimized algorithms" » "qoe optimized algorithm", "_ optimized algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimized algorithms", "_ optimize algorithms", "_ optimise algorithms"

Try widening your search to All Fields.

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