Perhaps you should try some spelling variations:
tnong nghiep » datnong nghiep, cong nghiep, huong nghiep
nong nghiep » cong nghiep, doanh nghiep
thiet hach » thien hach, thuyet hach, thiet hai
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tong cong » trong cong, cong cong, dung cong
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, manh toan

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 - dinh ((tnong nghiep) or (nong nghiep)) tong cong ((van toan) OR (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - dinh ((tnong nghiep) OR (nong nghiep)) tong cong ((van toan) OR (van thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet hach - dinh ((tnong nghiep) or (nong nghiep)) tong cong ((van toan) OR (van thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - dinh ((tnong nghiep) or (nong nghiep)) tong cong ((van toan) OR (van thanh)) cau*.