Perhaps you should try some spelling variations:
"qoe optimization algorithm" » "qoe optimization algorithms", "qoe optimisation algorithm", "qoe estimation algorithm", "game optimization algorithm", "_ optimization algorithm", "stage optimization algorithm"
"done optimized algorithms" » "done optimized algorithm", "done optimization algorithms", "dong optimized algorithms", "one optimized algorithms", "don optimized algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimization algorithms", "_ optimized algorithms", "_ optimize algorithms", "_ optimise 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: (((("done optimized algorithms") or ("_ optimizer algorithms"))) or ("qoe optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("done optimized algorithms") OR ("_ optimizer algorithms"))) OR ("qoe optimization algorithm")).
• Removing quotes may allow a broader search: (((( done optimized algorithms ) or ( _ optimizer algorithms ))) or ( qoe optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("done optimized algorithms") or ("_ optimizer algorithms"))) or ("qoe optimization algorithm"))*.