Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
bang cong » dang cong, bang song, hang cong
hanh han » hanh nhan, hanh phan, hanh san
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
va bang » va nang, va lang, va ban
han va » hang va, hanh va, nhan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (hoc hien)) sach - hanh han va bang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc hien)) sach - hanh han va bang cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc hien)) sach - hanh han va bang cong dan than cau*.