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