Perhaps you should try some spelling variations:
cong thuong » hang thuong
thanh dung » thanh duong, thanh tung, thanh hung
thuong dam » thuong mai, huong dan, truong dai
hoc chinh » hoan chinh, hoc sinh, hoc kinh
dung hua » dung nhua, dung cua, dung ha
hua cong » cua cong, qua cong, hoa cong
can cau » van cau, ban cau, ca cau
cua cay » cua 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 chinh sach - thanh dung hua cong thuong dam ((can cau) or (cua cay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - thanh dung hua cong thuong dam ((can cau) OR (cua cay)).
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - thanh dung hua cong thuong dam ((can cau) or (cua cay))*.