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