Perhaps you should try some spelling variations:
optimisation algorithms » optimisation algorithm, optimization algorithms, estimation algorithms
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
poses optimisation » qoe optimization
core » more, care
parameter » parameters

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