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"
"machinery using method algorithm" » "machinery using mom algorithm", "machines using method algorithm", "machinery nursing methods algorithm", "machinery focusing method algorithm", "machinery using metal 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: (("machinery using method algorithm") OR ("modified network optimization algorithms"))~.
• Removing quotes may allow a broader search: (( machinery using method algorithm ) or ( modified network optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("machinery using method algorithm") or ("modified network optimization algorithms"))*.