Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet qua » thien quan, hieu qua, thien quy
cho nguoi » cua nguoi
hien huan » hien thuan, hien quan, tien huan
qua danh » qua dan, luan danh, luat danh
nm hoc » n1 hoc, n3 hoc
am hoc » ad hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: giao trinh thiet qua danh cho nguoi viet ((nm hoc) OR (am hoc)) hien huan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thiet qua danh cho nguoi viet ((nm hoc) OR (am hoc)) hien huan".
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet qua danh cho nguoi viet ((nm hoc) OR (am hoc)) hien huan*.