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