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

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