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