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