Perhaps you should try some spelling variations:
trinh thiet » trinh thi
trinh viet » ninh viet, trinh vat
luat danh » luat doanh, luat dan, luat canh
cho nguoi » cua nguoi
qua danh » qua dan, luan danh, quoc danh
viet nma » viet nm, viet nami, viet nhat
hien han » hien hanh, hien huan, dien han
nma hoc » nha hoc, nhan 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) or (trinh viet)) ((qua danh) OR (luat danh)) cho nguoi viet nma hoc hien han~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao ((trinh thiet) OR (trinh viet)) ((qua danh) OR (luat danh)) cho nguoi viet nma hoc hien han.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao ((trinh thiet) or (trinh viet)) ((qua danh) OR (luat danh)) cho nguoi viet nma hoc hien han".
• Adding a wildcard symbol may retrieve word variants: giao ((trinh thiet) or (trinh viet)) ((qua danh) OR (luat danh)) cho nguoi viet nma hoc hien han*.