Perhaps you should try some spelling variations:
parameter optimisation » parameter optimization, parameter estimation
optimisation algorithm » optimization algorithms, estimation algorithms
learning estimation » learning emotion, lighting estimation
when learning » deep learning, how learning, shot learning

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( when learning estimation algorithm ) OR ( modified parameter optimisation algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( when learning estimation algorithm ) OR ( modified parameter optimisation algorithm ))*.