Perhaps you should try some spelling variations:
passive estimation » pose estimation
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified passive » modified adaptive
modified trace » modified traces, modified male, modified orca
trace solution » exact solution, nacl solution

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: "(( modified passive estimation algorithm ) OR ( modified trace solution algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified passive estimation algorithm ) OR ( modified trace solution algorithm ))*.