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