Perhaps you should try some spelling variations:
cong thuong » hang thuong
thuong ung » thuong dung, thuong hung, huong ung
hoc thieu » hoc hien
dung dat » dung va, dung tai
dat van » dao van, dat va, dam van
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang ban, van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc thieu) or (hoc thieu)) sang - cong thuong ung dung dat van tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (hoc thieu)) sang - cong thuong ung dung dat van tan ban*.