Perhaps you should try some spelling variations:
"modified make optimization algorithms" » "modified make optimisation algorithm", "modified make estimation algorithms", "modified make estimation algorithm", "modified market optimization algorithms", "modified game optimization algorithms", "modified stage optimization algorithms", "modified male optimization algorithms"
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near approximation algorithms"

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