Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
passive estimation » pose estimation
emotion algorithm » evolution algorithm, estimation algorithm, predation algorithm
modified passive » modified adaptive
learning emotion » learning method
mobile learning » machine learning

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified passive estimation algorithms ) or ( mobile learning emotion algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified passive estimation algorithms ) OR ( mobile learning emotion algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified passive estimation algorithms ) or ( mobile learning emotion algorithm ))*.