Perhaps you should try some spelling variations:
"certified network optimization algorithm" » "certified network optimization algorithms", "certified network optimisation algorithm", "certified network estimation algorithm", "verified network optimization algorithm"
"modified objective allocation algorithm" » "modified objective estimation algorithm", "modified objective evolution algorithm", "modified objective 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: (("certified network optimization algorithm") or ("modified objective allocation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("certified network optimization algorithm") OR ("modified objective allocation algorithm")).
• Removing quotes may allow a broader search: (( certified network optimization algorithm ) or ( modified objective allocation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("certified network optimization algorithm") or ("modified objective allocation algorithm"))*.