Perhaps you should try some spelling variations:
"modified stochastic optimization algorithms" » "modified stochastic optimisation algorithm", "modified stochastic estimation algorithms", "modified stochastic estimation algorithm"
"modified response approximation algorithms" » "modified one approximation algorithms", "modified response association 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 response approximation algorithms") or ("modified stochastic optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified response approximation algorithms") OR ("modified stochastic optimization algorithms")).
• Removing quotes may allow a broader search: (( modified response approximation algorithms ) or ( modified stochastic optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified response approximation algorithms") or ("modified stochastic optimization algorithms"))*.