Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
luan dang » luan nang, luan dong, luan tang
luan danh » luan thanh, luan van, luan nang
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 - anh tang ((luan dang) or (luan danh)) cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh tang ((luan dang) OR (luan danh)) cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang ((luan dang) or (luan danh)) cong dan toan cao*.