Perhaps you should try some spelling variations:
"defined network optimization algorithm" » "defined network optimization algorithms", "defined network optimisation algorithm", "defined network estimation algorithm", "designed network optimization algorithm"
"modified invasive optimized algorithms" » "modified invasive optimized algorithm", "modified invasive optimizer algorithms", "modified invasive optimization algorithms", "modified passive optimized algorithms"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("defined network optimization algorithm") OR ("modified invasive optimized algorithms"))~.
• Removing quotes may allow a broader search: (( defined network optimization algorithm ) or ( modified invasive optimized algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network optimization algorithm") or ("modified invasive optimized algorithms"))*.