Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
bang cong » dang cong, bang song, hang cong
than cua » nhan cua, thai cua, ban cua
tang cua » mang cua, hang cua, tang luan
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh ((than cua) or (tang cua)) bang cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((than cua) OR (tang cua)) bang cong tan than cau*.