Perhaps you should try some spelling variations:
"a optimization algorithms" » "a optimisation algorithm", "a estimation algorithm", "a optimized algorithms", "_ optimization algorithms", "_ optimisation algorithms", "game optimization algorithms"
"pose estimation algorithms" » "pose estimation algorithm", "pose optimisation algorithm", "pose approximation algorithms", "poses estimation algorithms", "post estimation algorithms", "jose estimation algorithms"
"a simulation algorithm" » "a estimation algorithm", "a solution algorithm", "a optimisation algorithm", "_ simulation algorithm"

Try widening your search to All Fields.

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