Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoa thiet » toan thiet, hoa viet, va thiet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
mat thong » suat thong, xuat thong, mang thong
nong san » cong san, dong san, nong dan
tran van » luan van
san mat » gan mat, san bat, san xuat
tan san » tai san, tan van, han san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoa thiet) OR (hoc thiet)) tach - nong san mat thong cong ((tan san) or (tran van)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoa thiet) OR (hoc thiet)) tach - nong san mat thong cong ((tan san) OR (tran van)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoa thiet) OR (hoc thiet)) tach - nong san mat thong cong ((tan san) or (tran van)) cau".
• Adding a wildcard symbol may retrieve word variants: ((hoa thiet) OR (hoc thiet)) tach - nong san mat thong cong ((tan san) or (tran van)) cau*.