Perhaps you should try some spelling variations:
"modified network optimization algorithm" » "modified network optimization algorithms", "modified network optimisation algorithm", "modified network estimation algorithm", "certified network optimization algorithm", "defined network optimization algorithm", "modified near optimization algorithm"
"modified chu predation algorithm" » "modified chu predators algorithm", "modified chu estimation algorithm", "modified _ predation algorithm", "modified churn prediction algorithm", "modified bi1 predation algorithm", "modified df predation algorithm"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified chu predation algorithm") or ("modified network optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified chu predation algorithm") OR ("modified network optimization algorithm")).
• Removing quotes may allow a broader search: (( modified chu predation algorithm ) or ( modified network optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified chu predation algorithm") or ("modified network optimization algorithm"))*.