Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
dong cong » duong cong, dung cong, dang cong
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
cong tan » cong tac, cong san, cong thanh
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 - thanh ((tung cua) OR (dung cua)) dong cong tan ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh ((tung cua) OR (dung cua)) dong cong tan ((toan tap) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh ((tung cua) OR (dung cua)) dong cong tan ((toan tap) or (toan ban))*".