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"
"boiler using method algorithm" » "boiler using mom algorithm", "powder using method algorithm", "boiler nursing methods algorithm", "boiler focusing method algorithm", "boiler using metal algorithm"

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

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