Perhaps you should try some spelling variations:
trinh thiet » trinh viet
trinh thi » trinh tai, dinh thi, trinh tu
cho nguoi » cua nguoi
qua danh » qua dan, luan danh, luat 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 thi)) qua 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 thi)) qua danh cho nguoi viet nma hoc hien han".
• Adding a wildcard symbol may retrieve word variants: giao ((trinh thiet) OR (trinh thi)) qua danh cho nguoi viet nma hoc hien han*.