Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh trang va nhung cong dan ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (kien sach)) - hanh trang va nhung cong dan ((than cau) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - hanh trang va nhung cong dan ((than cau) OR (than cap))*.