Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
machine graining » machine learning
graining methods » learning methods, learning method, making methods
df optimization » _ optimization, qoe optimization, _ optimisation
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 optimization algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( machine graining methods algorithm ) OR ( modified df optimization algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( machine graining methods algorithm ) OR ( modified df optimization algorithm ))*.