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