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

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 algorithms") OR ("modified response optimization algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified passive quantization algorithms\") OR (\"modified response optimization algorithms\"))".
• Removing quotes may allow a broader search: (( modified passive quantization algorithms ) OR ( modified response optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified passive quantization algorithms") OR ("modified response optimization algorithms"))*.