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