Perhaps you should try some spelling variations:
"modified parameters estimation algorithms" » "modified parameter estimation algorithms", "modified parameter estimates algorithms", "modified parameter optimization algorithms", "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male 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 parameters estimation algorithms") OR ("modified time approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified parameters estimation algorithms ) or ( modified time approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified parameters estimation algorithms") or ("modified time approximation algorithms"))*.