Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, optimized algorithms
learning estimation » learning emotion, lighting estimation
df optimization » _ optimization, qoe optimization, _ optimisation
how learning » shot learning, when learning, _ learning
modified df » modified _, modified adam, modified bi1

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

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