Perhaps you should try some spelling variations:
"same estimation algorithms" » "same optimization algorithms", "same optimisation algorithm", "same approximation algorithms", "pose estimation algorithms", "sphere estimation algorithms"
"_ optimizer algorithms" » "_ optimized algorithms", "_ optimized algorithm", "_ optimization algorithms", "_ optimize algorithms", "_ optimise algorithms"
"same estimation algorithm" » "pose estimation algorithm", "sphere estimation algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("same estimation algorithms") or ("same estimation algorithm"))) or ("_ optimizer algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("same estimation algorithms") OR ("same estimation algorithm"))) OR ("_ optimizer algorithms")).
• Removing quotes may allow a broader search: (((( same estimation algorithms ) or ( same estimation algorithm ))) or ( _ optimizer algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("same estimation algorithms") or ("same estimation algorithm"))) or ("_ optimizer algorithms"))*.