Perhaps you should try some spelling variations:
cao thuong » cao truong, ca thuong, cho thuong
hieu sang » chieu sang, hieu lang, hieu quang
thong ban » thong van, trong ban, thong bai
ban thanh » ban hanh, ban hang
thanh cau » thanh chau, thanh mau, nhanh cau
doc hieu » toc thieu, hoc thieu, hoc hien
cua dong » chua dong, cua cong, cua dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - canh tranh ((cua dong) or (cao thuong)) thong ban thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - canh tranh ((cua dong) OR (cao thuong)) thong ban thanh cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - canh tranh ((cua dong) or (cao thuong)) thong ban thanh cau*.