Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"mapping forecasting mixed algorithm" » "mapping forecasting method algorithm", "mapping forecasting air algorithm", "mapping forecasting driven algorithm", "mapping forecasting winner 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: (("mapping forecasting mixed algorithm") OR ("modified notion approximation algorithms"))~.
• Removing quotes may allow a broader search: (( mapping forecasting mixed algorithm ) or ( modified notion approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("mapping forecasting mixed algorithm") or ("modified notion approximation algorithms"))*.