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"
"qoe estimation algorithms" » "qoe estimation algorithm", "qoe optimisation algorithm", "qoe approximation algorithms", "pose estimation algorithms", "_ estimation algorithms", "cover estimations algorithms"
"_ optimized algorithm" » "_ optimized algorithms", "_ optimizer algorithms"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("_ optimized algorithm") or ((("qoe estimation algorithms") OR ("qoe optimization algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ optimized algorithm") OR ((("qoe estimation algorithms") OR ("qoe optimization algorithms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ optimized algorithm\") or (((\"qoe estimation algorithms\") OR (\"qoe optimization algorithms\"))))".
• Removing quotes may allow a broader search: (( _ optimized algorithm ) or ((( qoe estimation algorithms ) OR ( qoe optimization algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("_ optimized algorithm") or ((("qoe estimation algorithms") OR ("qoe optimization algorithms"))))*.