Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
method algorithm » mom algorithm
mobile learning » machine learning
learning method » learning methods, graining methods, learning emotion
df optimisation » _ optimisation, _ optimization, qoe optimization
modified df » modified _, modified adam, modified bi1

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: "(( mobile learning method algorithm ) OR ( modified df optimisation algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( mobile learning method algorithm ) OR ( modified df optimisation algorithm ))*.