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
minh niem » minh hien, minh hieu, minh kieu
cua thuoc » nha thuoc, cay thuoc, cua quoc
thiet tu » thien tu, thit tu, thiet yeu
cua nuoc » cua quoc, cua nguoi, nha nuoc
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 thuoc) OR (cua nuoc)) ))~.
• 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 thuoc) OR (cua nuoc)) )).
• 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 thuoc) OR (cua nuoc)) ))".
• Adding a wildcard symbol may retrieve word variants: (( thuc canh tranh thiet tu hoc ) or ( te sach minh niem ((cua thuoc) OR (cua nuoc)) ))*.