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