Perhaps you should try some spelling variations:
location estimation » motion estimation
modified location » modified carbon
method algorithm » mom algorithm
mobile learning » machine learning
learning method » learning methods, graining methods, learning emotion

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( mobile learning method algorithm ) OR ( modified location estimation algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( mobile learning method algorithm ) OR ( modified location estimation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( mobile learning method algorithm ) OR ( modified location estimation algorithm ))*.