Perhaps you should try some spelling variations:
quantization algorithm » estimation algorithm
passive quantization » adaptive quantization
modified passive » modified adaptive
learning methods » nursing methods
mobile learning » machine learning

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

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