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

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

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