Perhaps you should try some spelling variations:
convolution algorithm » convolution algorithms, evolution algorithm, solution algorithm
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
passive estimation » pose estimation
modified learning » mobile learning, modified caging
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 passive estimation algorithms ) OR ( modified learning convolution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified passive estimation algorithms ) or ( modified learning convolution algorithm ))*.