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

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 ((nong van) OR (nong san)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh dung va hang ((nong van) OR (nong san)) ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh dung va hang ((nong van) OR (nong san)) ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh dung va hang ((nong van) OR (nong san)) ((toan cau) or (toan cao))*.