Perhaps you should try some spelling variations:
quantization algorithm » estimation algorithm
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
passive quantization » adaptive quantization
modified passive » modified adaptive
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified df optimization algorithm ) OR ( modified passive quantization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified df optimization algorithm ) or ( modified passive quantization algorithm ))*.