Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
dong luan » dung luan, tong luan, dong xuan
anh dong » anh huong, anh son
luan han » luan hoan, luan phan, luan van
han nong » hang nong, han tong, phan cong
dan toan » van toan, manh toan, xuan toan
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 - anh dong luan han nong ((dan toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh dong luan han nong ((dan toan) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh dong luan han nong ((dan toan) or (dan than)) cao*.