Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
dong thanh » truong thanh
hien manh » hien hanh, tien manh, hieu manh
trinh cua » tinh cua, trinh luat, trinh luan
hang dong » hang nong, hang cong, hanh dong
can cau » van cau, ban cau, cac cau
ca cau » cua cau, cac cau, ca cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - hanh ((trinh cua) or (trinh quan)) hang dong thanh ((can cau) or (ca cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - hanh ((trinh cua) OR (trinh quan)) hang dong thanh ((can cau) OR (ca cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - hanh ((trinh cua) or (trinh quan)) hang dong thanh ((can cau) or (ca cau))*.