Perhaps you should try some spelling variations:
cong thuong » hang thuong
hanh trung » thanh trung, hanh trang, manh trung
hieu sang » chieu sang, hieu lang, hieu quang
trung cap » truong cao, trung tam
dan thanh » dang thanh, danh thanh, ban thanh
doc hieu » toc thieu, hoc thieu, hoc hien
cap cong » cac cong, cao cong, tap cong
ban hanh » ban hang

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 - hanh trung cap cong thuong ((ban hanh) or (dan thanh)) ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh trung cap cong thuong ((ban hanh) OR (dan thanh)) ca*.