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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("qoe estimation algorithm") or ((("risk optimized algorithms") OR ("risk optimized algorithm"))))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"qoe estimation algorithm\") or (((\"risk optimized algorithms\") OR (\"risk optimized algorithm\"))))".
• Removing quotes may allow a broader search: (( qoe estimation algorithm ) or ((( risk optimized algorithms ) OR ( risk optimized algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("qoe estimation algorithm") or ((("risk optimized algorithms") OR ("risk optimized algorithm"))))*.