Perhaps you should try some spelling variations:
"sphere estimation algorithms" » "sphere estimation algorithm", "sphere optimization algorithms", "sphere optimisation algorithm", "pose estimation algorithms"
"_ optimized algorithms" » "_ optimizer algorithms", "_ optimization algorithms", "_ optimizer algorithmss"
"qoe optimized algorithm" » "qoe optimizer 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: (("sphere estimation algorithms") or ((("_ optimized algorithms") or ("qoe optimized algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("sphere estimation algorithms") OR ((("_ optimized algorithms") OR ("qoe optimized algorithm")))).
• Removing quotes may allow a broader search: (( sphere estimation algorithms ) or ((( _ optimized algorithms ) or ( qoe optimized algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("sphere estimation algorithms") or ((("_ optimized algorithms") or ("qoe optimized algorithm"))))*.