Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
tinh cua » trinh cua, sinh cua, tinh chat
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

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