Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
tranh va » tranh van, trang va, trinh va
cong van » cong vang, cong san, song van
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - canh tranh va nhung cong van ((than cau) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - canh tranh va nhung cong van ((than cau) OR (than cap))*.