Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, anh trinh
cong thang » cong thanh, cang thang, cong thong
hoc chieu » hoc thieu, ho chieu, hoc hien
canh tinh » hanh tinh, manh tinh, canh tranh
dong cong » duong cong, dung cong, dang cong
thang van » tang van, thanh van, thong van
van dau » van dao, phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - ((canh trinh) or (canh tinh)) van dong cong thang van dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((canh trinh) OR (canh tinh)) van dong cong thang van dau*.