Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, chieu sach, vien bach
kien sach » dien sach, vien bach, kien mac
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 ((((hien sach) OR (thien hach))) OR (kien sach)) - canh trinh va nhung cong dan toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien sach) or (thien hach))) or (kien sach)) - canh trinh va nhung cong dan toan cau*.