Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
ca thuong » cao thuong, cua thuong, va thuong
doc hieu » toc thieu, hoc thieu, hoc hien
nang ban » hang ban, nang quan, nang sang
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
ban ca » ban cua, ban can, ban cam

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) or (mot chieu)) sang - nang ban ca thuong cong dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (mot chieu)) sang - nang ban ca thuong cong dan phan tu*.