Perhaps you should try some spelling variations:
parameters estimation » parameter estimates, parameter optimization
estimation algorithms » optimization algorithms, optimisation algorithm, approximation algorithms
parameter estimation » parameter estimates, parameter optimization
code parameter » one parameter, common parameter

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• Performing a fuzzy search may retrieve terms with similar spellings: (( code parameter estimation algorithm ) or ( modified parameters estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( code parameter estimation algorithm ) OR ( modified parameters estimation algorithms ))*.