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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"_ optimization algorithms\") OR (\"qoe estimation algorithm\"))) OR (\"_ estimation algorithms\"))~".
• Removing quotes may allow a broader search: (((( _ optimization algorithms ) OR ( qoe estimation algorithm ))) OR ( _ estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (((("_ optimization algorithms") OR ("qoe estimation algorithm"))) OR ("_ estimation algorithms"))*.