Perhaps you should try some spelling variations:
"modified parameter estimation algorithms" » "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter approximation algorithms", "modified parameter estimates algorithms"
"mobile learning estimation algorithm" » "mobile learning emotion algorithm", "mobile lighting estimation algorithm", "machine learning estimation algorithm"

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: (("mobile learning estimation algorithm") OR ("modified parameter estimation algorithms"))~.
• Removing quotes may allow a broader search: (( mobile learning estimation algorithm ) or ( modified parameter estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("mobile learning estimation algorithm") or ("modified parameter estimation algorithms"))*.