Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
chiet tach » chieu sach
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
toan cau » 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 hach) OR (chiet tach)) - canh tranh cua hang cong dan ((than cau) OR (toan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) or (chiet tach)) - canh tranh cua hang cong dan ((than cau) OR (toan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) or (chiet tach)) - canh tranh cua hang cong dan ((than cau) OR (toan cau))*.