Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu khang » chieu khong, thieu quang
chieu sang » chieu sach, chieu xanh, hieu lang
dung huong » dung thuong, dung phuong, dong huong
trung vat » trung va, trung van, trong vat
thanh lap » thanh san, phan lap, thanh hai
vat dung » van dung, va dung, viet dung
than cap » khan cap, thanh cac, than cua

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 khang) OR (chieu sang)) - thanh trung vat dung huong dan ((than cap) OR (thanh lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu khang) or (chieu sang)) - thanh trung vat dung huong dan ((than cap) OR (thanh lap))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu khang) or (chieu sang)) - thanh trung vat dung huong dan ((than cap) OR (thanh lap))*.