Perhaps you should try some spelling variations:
"defined network optimization algorithms" » "defined network optimisation algorithm", "defined network estimation algorithms", "defined network estimation algorithm"
"modified passive solution algorithm" » "modified passive evolution algorithm", "modified passive convolution algorithms", "modified passive evolutionary algorithm", "modified adaptive solution algorithm", "modified positive solutions algorithm", "modified saline solution algorithm"

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

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