Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » thong cong, nhung don, nhung lang
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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 sach - hanh tranh cua ((((nhung cong) OR (hang cong))) OR (dung cong)) san toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh tranh cua ((((nhung cong) OR (hang cong))) or (dung cong)) san toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh tranh cua ((((nhung cong) OR (hang cong))) or (dung cong)) san toan cao*.