Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan bang » luan nang, luan ban, luan tang
bang cong » dang cong, bang song, hang cong
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh tang luan bang cong ((van toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh tang luan bang cong ((van toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh tang luan bang cong ((van toan) or (dan than)) cau*.