Perhaps you should try some spelling variations:
optimization algorithms » estimation algorithm, optimized algorithms, optimizer algorithms
optimisation algorithm » estimation algorithm
estimation algorithms » estimation algorithm, approximation algorithms
pose optimisation » qoe optimization, _ optimisation, pose estimation

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