Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
notion estimation » motion estimation
mobile learning » machine learning
a algorithm » _ algorithm, _ algorithms, adam algorithm
learning a » 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 notion estimation algorithms ) or ( mobile learning a algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified notion estimation algorithms ) OR ( mobile learning a algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified notion estimation algorithms ) or ( mobile learning a algorithm ))*.