Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithms", "_ optimized algorithms"
"qoe optimized algorithm" » "qoe optimized algorithms", "qoe optimizer algorithms", "_ optimized algorithm"
"pose estimation algorithm" » "poses estimation algorithm", "post estimation algorithm", "jose estimation algorithm"

Try widening your search to All Fields.

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