Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
truong cong » trong cong, truong dong, truong long
thieu sang » chieu sang, thieu quang, hieu lang
cua truong » cua trung, xuan truong, cac truong
trung cua » truong cua, trung tuan, trung cap
cong san » cong tac

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) OR (thieu khang)) - thanh trung cua truong cong san ((toan ban) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu khang)) - thanh trung cua truong cong san ((toan ban) OR (van ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - thanh trung cua truong cong san ((toan ban) OR (van ban))*.