Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, thieu cac
doanh luan » doanh nhan
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cau » toan cau, phan cau, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hach) OR (hieu cach)) - canh ((doanh cua) OR (doanh luan)) nhung cong van than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) OR (hieu cach)) - canh ((doanh cua) or (doanh luan)) nhung cong van than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) OR (hieu cach)) - canh ((doanh cua) or (doanh luan)) nhung cong van than cau*.