Perhaps you should try some spelling variations:
"modified static optimization algorithm" » "modified static optimization algorithms", "modified static optimisation algorithm", "modified static estimation algorithm", "modified stage optimization algorithm", "modified stochastic optimization algorithm", "modified staffing optimization algorithm"
"modified passive approximation algorithms" » "modified time approximation algorithms", "modified adaptive 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 passive approximation algorithms") OR ("modified static optimization algorithm"))~.
• Removing quotes may allow a broader search: (( modified passive approximation algorithms ) or ( modified static optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive approximation algorithms") or ("modified static optimization algorithm"))*.