Perhaps you should try some spelling variations:
thiet dang » thien dang, nhiet dong, nhiet nang
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
doanh cua » doanh luan
trung cua » truong cua, trung tuan, trung cap
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet dang - hanh ((doanh cua) or (trung cua)) nhung cong ban than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet dang - hanh ((doanh cua) OR (trung cua)) nhung cong ban than ban.
• Adding a wildcard symbol may retrieve word variants: hoc thiet dang - hanh ((doanh cua) or (trung cua)) nhung cong ban than ban*.