Perhaps you should try some spelling variations:
"modified network optimization algorithms" » "modified network optimisation algorithm", "modified network estimation algorithms", "modified network estimation algorithm", "certified network optimization algorithms", "defined network optimization algorithms", "modified near optimization algorithms"
"modified learning method algorithm" » "mobile learning method algorithm", "modified caging method algorithm", "modified learning mom algorithm", "modified learning methods algorithm", "modified graining methods algorithm", "modified learning emotion algorithm"

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: (("modified network optimization algorithms") OR ("modified learning method algorithm"))~.
• Removing quotes may allow a broader search: (( modified network optimization algorithms ) or ( modified learning method algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified network optimization algorithms") or ("modified learning method algorithm"))*.