Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
hanh dung » thanh dung, anh dung, hanh dong
van hang » van khang, van hoang, van thang
nong van » song van, nong dan, nong san
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap
va hang » va nang, va lang, va hanh

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 dung ((va hang) or (van hang)) nong van ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh dung ((va hang) OR (van hang)) nong van ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh dung ((va hang) or (van hang)) nong van ((toan tai) or (toan cao))*.