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

Try widening your search to All Fields.

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