Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
luat danh » luat doanh, luat dan, luat canh
cho nguoi » cua nguoi
hien huan » hien thuan, hien quan, tien huan
qua danh » qua dan, luan danh, quoc danh
viet nm » viet nam, viet nami, viet anh
nm hoc » am hoc, n1 hoc, n3 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) OR (luat danh)) cho nguoi viet nm hoc hien huan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thiet ((qua danh) OR (luat danh)) cho nguoi viet nm hoc hien huan".
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet ((qua danh) OR (luat danh)) cho nguoi viet nm hoc hien huan*.