Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
nhung cong » thong cong, hang cong, nhung don
dang thanh » dong thanh, dang hanh, hoang thanh
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
dung cong » dung trong
dang van » hoang van, hang va

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 - canh tranh cua ((nhung cong) OR (dung cong)) ((dang thanh) OR (dang van)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu hach - canh tranh cua ((nhung cong) OR (dung cong)) ((dang thanh) or (dang van)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - canh tranh cua ((nhung cong) OR (dung cong)) ((dang thanh) or (dang van)) cau*.