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