Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
trung tuan » trung thanh, trung tam, tran tuan
tuan thong » toan thong, tran thong, tuan phong
hoc thieu » toc thieu, hoc hien
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung tuan thong ((cong tan) OR (cong san)) ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - thanh trung tuan thong ((cong tan) OR (cong san)) ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung tuan thong ((cong tan) OR (cong san)) ((toan tap) or (toan ban))*.