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"

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: (("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"))))*.