Perhaps you should try some spelling variations:
"qoe optimization algorithms" » "qoe optimisation algorithm", "qoe estimation algorithm", "qoe optimized algorithms", "game optimization algorithms", "_ optimization algorithms", "stage optimization algorithms"
"jose estimation algorithms" » "jose estimation algorithm", "jose optimisation algorithm", "jose approximation algorithms", "pose estimation algorithms", "risk estimation algorithms", "cover estimations algorithms"
"_ optimize algorithm" » "_ optimized algorithm", "_ optimized algorithms", "_ optimizer algorithms"

Try widening your search to All Fields.

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