Perhaps you should try some spelling variations:
"modified carbon optimization algorithms" » "modified carbon optimisation algorithm", "modified carbon estimation algorithms", "modified carbon estimation algorithm", "modified market optimization algorithms"
"modified objective approximation algorithm" » "modified objective approximation algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified carbon optimization algorithms") or ("modified objective approximation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified carbon optimization algorithms") OR ("modified objective approximation algorithm"))*.
• Removing quotes may allow a broader search: (( modified carbon optimization algorithms ) or ( modified objective approximation algorithm ))*.