Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
luat danh » luat doanh, luat dan, luan danh
luat canh » luat doanh, luat kinh, luc canh
viet nami » viet nam, vien nam, viet nang
hien quan » thien quan, lien quan, vien quan
tien huan » hien huan, tien duan, tieu chuan
nami hoc » dai hoc, bai hoc, nang 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 hieu ((luat danh) OR (luat canh)) cua nguoi viet nami hoc ((hien quan) or (tien huan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu ((luat danh) OR (luat canh)) cua nguoi viet nami hoc ((hien quan) OR (tien huan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh hieu ((luat danh) OR (luat canh)) cua nguoi viet nami hoc ((hien quan) or (tien huan))".
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu ((luat danh) OR (luat canh)) cua nguoi viet nami hoc ((hien quan) or (tien huan))*.