Perhaps you should try some spelling variations:
"modified adaptive quantization algorithm" » "modified adaptive estimation algorithm", "modified adaptive ventilation algorithm", "modified passive quantization algorithm"
"modified legacy approximation algorithms" » "modified average approximation algorithms", "modified legacy applications algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified adaptive quantization algorithm") OR ("modified legacy approximation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified adaptive quantization algorithm\") OR (\"modified legacy approximation algorithms\"))*".
• Removing quotes may allow a broader search: (( modified adaptive quantization algorithm ) OR ( modified legacy approximation algorithms ))*.