Perhaps you should try some spelling variations:
"qoe optimization algorithm" » "qoe optimization algorithms", "qoe estimation algorithm", "qoe optimized algorithm", "game optimization algorithm", "_ optimization algorithm", "stage optimization algorithm"
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ optimization algorithm"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ approximation 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: (("qoe optimization algorithm") or ((("_ optimisation algorithm") OR ("_ estimation algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("qoe optimization algorithm") OR ((("_ optimisation algorithm") OR ("_ estimation algorithms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"qoe optimization algorithm\") or (((\"_ optimisation algorithm\") OR (\"_ estimation algorithms\"))))".
• Removing quotes may allow a broader search: (( qoe optimization algorithm ) or ((( _ optimisation algorithm ) OR ( _ estimation algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("qoe optimization algorithm") or ((("_ optimisation algorithm") OR ("_ estimation algorithms"))))*.