Perhaps you should try some spelling variations:
tranh thiet » trinh thiet, trang thiet, toan thiet
thuc canh » thuc hanh, thu canh, thuc cach
sach minh » sach kinh, sach danh, sac tinh
thiet tu » thien tu, thit tu, thiet yeu
niem cua » nhiem cua, niem chua, nien cua
diem cua » dieu cua, dien cua, diem ca
te sach » toc sach
tu hoc » te hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuc canh tranh thiet tu hoc ) or ( te sach minh ((niem cua) OR (diem cua)) thuoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc canh tranh thiet tu hoc ) OR ( te sach minh ((niem cua) OR (diem cua)) thuoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuc canh tranh thiet tu hoc ) or ( te sach minh ((niem cua) OR (diem cua)) thuoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuc canh tranh thiet tu hoc ) or ( te sach minh ((niem cua) OR (diem cua)) thuoc ))*.