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