Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
quadratic estimation » quadratic optimization, quantile estimation
evolution algorithm » solution algorithm, evolutionary algorithm, convolution algorithms
positive evolution » positive solutions
modified positive » modified passive, modified adaptive

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified quadratic estimation algorithms ) OR ( modified positive evolution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified quadratic estimation algorithms ) or ( modified positive evolution algorithm ))*.