Perhaps you should try some spelling variations:
commercial credit » commercial code
preventive scale » preventive care, preventive health, prevention case
scale studies » case studies
card based » car based, care based, case based
cad based » case based, land based, acid based
cfd based » bdd based

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: commercial credit ((card based) or (((cad based) OR (cfd based)))) preventive scale studies.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial credit ((card based) OR (((cad based) OR (cfd based)))) preventive scale studies..
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial credit ((card based) or (((cad based) OR (cfd based)))) preventive scale studies.".
• Adding a wildcard symbol may retrieve word variants: commercial credit ((card based) or (((cad based) OR (cfd based)))) preventive scale studies.*.