Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
nguong dan » huong dan
hoc thieu » toc thieu, hoc hien
trung cap » truong cao, trung tam
cap bang » cao bang, can bang, lap bang
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - thanh trung cap bang ((cong tan) or (nguong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung cap bang ((cong tan) OR (nguong dan)) toan tap*.