Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
nho hieu » nha hieu, nho sieu, nhu hieu
tinh cua » trinh cua, sinh cua, tinh chat
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: nho hieu lang - hanh ((trinh luan) or (tinh cua)) thong ((cong dan) or (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - hanh ((trinh luan) OR (tinh cua)) thong ((cong dan) OR (cong san)) toan tap.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh ((trinh luan) or (tinh cua)) thong ((cong dan) or (cong san)) toan tap*.