Perhaps you should try some spelling variations:
quantization algorithm » estimation algorithm
adaptive quantization » adaptive ventilation
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
modified adaptive » modified passive
df estimation » _ estimation
modified df » modified _, modified adam, modified bi1

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified adaptive quantization algorithm ) OR ( modified df estimation algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified adaptive quantization algorithm ) OR ( modified df estimation algorithms ))*.