Perhaps you should try some spelling variations:
"a optimisation algorithm" » "a optimization algorithms", "_ optimisation algorithm", "_ optimization algorithm", "game optimization algorithm"
"pose estimation algorithms" » "pose optimization algorithms", "pose approximation algorithms"
"a estimation algorithm" » "_ estimation algorithm", "a destination algorithm", "_ estimating algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a optimisation algorithm") OR ("a estimation algorithm"))) or ("pose estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a optimisation algorithm") OR ("a estimation algorithm"))) OR ("pose estimation algorithms")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a optimisation algorithm\") OR (\"a estimation algorithm\"))) or (\"pose estimation algorithms\"))".
• Removing quotes may allow a broader search: (((( a optimisation algorithm ) OR ( a estimation algorithm ))) or ( pose estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("a optimisation algorithm") OR ("a estimation algorithm"))) or ("pose estimation algorithms"))*.