Perhaps you should try some spelling variations:
tranh thong » tran thong, tranh trong, trinh thong
hang cong » dang cong, hang nong, bang cong
ban nhanh » ban hanh, ban thanh, ban nhan
nhanh bac » nhanh ha, nhanh va
doc hieu » toc thieu, hoc thieu, hoc hien
thong va » trong va, thong cua, truong va
cong ban » cong bang, cong san, cong tan
va hang » van hang, va nang, va lang

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 - tranh thong va hang cong ban nhanh bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (mot chieu)) sang - tranh thong va hang cong ban nhanh bac.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (mot chieu)) sang - tranh thong va hang cong ban nhanh bac*.