Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
machine graining » machine learning
graining methods » learning methods, learning method, making methods
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.

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