Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » trinh luat, trinh quan, trinh luan
hoi hieu » hoi phieu, hoi tieu, moi hieu
tinh cua » sinh cua, tinh chat, tranh cua
nong san » cong san, dong san, trong san
nong dan » cong dan, nguong dan, huong dan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - thanh ((trinh cua) OR (tinh cua)) cong ((nong san) or (nong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - thanh ((trinh cua) OR (tinh cua)) cong ((nong san) OR (nong dan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - thanh ((trinh cua) OR (tinh cua)) cong ((nong san) or (nong dan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh ((trinh cua) OR (tinh cua)) cong ((nong san) or (nong dan)) toan tap*.