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

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