Perhaps you should try some spelling variations:
"a optimisation algorithm" » "a optimization algorithms", "a estimation algorithm", "_ optimisation algorithm", "_ optimization algorithm", "game optimization algorithm"
"pose estimation algorithms" » "pose estimation algorithm", "pose optimization algorithms", "pose approximation algorithms", "poses estimation algorithms", "post estimation algorithms", "jose estimation algorithms"
"a solution algorithm" » "a evolution algorithm", "a convolution algorithms", "a evolutionary algorithm", "_ solution algorithm", "_ solutions algorithm", "nacl solution algorithm"

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