Perhaps you should try some spelling variations:
"modified passive convolution algorithms" » "modified passive evolution algorithm", "modified passive solution algorithm", "modified adaptive convolution algorithms"
"modified df approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified adam approximation algorithms", "modified bi1 approximation 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 df approximation algorithms") OR ("modified passive convolution algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified df approximation algorithms\") OR (\"modified passive convolution algorithms\"))".
• Removing quotes may allow a broader search: (( modified df approximation algorithms ) OR ( modified passive convolution algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified df approximation algorithms") OR ("modified passive convolution algorithms"))*.