Perhaps you should try some spelling variations:
tnong nghiep » datnong nghiep, cong nghiep, huong nghiep
thuyet hach » thuyet mach, thuyet xac, thuyet cac
nong nghiep » cong nghiep, doanh nghiep
thiet hach » thien hach, thiet hai, chiet tach
tong cong » trong cong, cong cong, dung cong
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cau » 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: hoc ((thiet hach) OR (thuyet hach)) - dinh ((tnong nghiep) or (nong nghiep)) tong cong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet hach) OR (thuyet hach)) - dinh ((tnong nghiep) OR (nong nghiep)) tong cong van toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet hach) OR (thuyet hach)) - dinh ((tnong nghiep) or (nong nghiep)) tong cong van toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet hach) OR (thuyet hach)) - dinh ((tnong nghiep) or (nong nghiep)) tong cong van toan cau*.