Perhaps you should try some spelling variations:
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"qoe estimation algorithms" » "qoe estimation algorithm", "qoe optimization algorithms", "qoe optimisation algorithm", "pose estimation algorithms", "_ estimation algorithms", "cover estimations algorithms"
"_ optimize algorithms" » "_ optimized algorithms", "_ optimizer algorithms", "_ optimized algorithm", "_ optimise algorithms"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimization algorithm") OR ("qoe estimation algorithms"))) OR ("_ optimize algorithms"))~.
• Removing quotes may allow a broader search: (((( _ optimization algorithm ) or ( qoe estimation algorithms ))) or ( _ optimize algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (((("_ optimization algorithm") or ("qoe estimation algorithms"))) or ("_ optimize algorithms"))*.