Perhaps you should try some spelling variations:
"qoe optimization algorithm" » "qoe optimization algorithms", "qoe optimisation algorithm", "qoe estimation algorithm", "game optimization algorithm", "stage optimization algorithm", "_ optimisation algorithm"
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"

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