Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung lung » trung dung, trung hung, trung long
lung hang » luong hang, luong khang, hung thang
hang cong » dang cong, hang nong, bang cong
hieu van » hieu va, thien van, lieu va
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (hieu van)) - thanh trung lung hang cong dan than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu van)) - thanh trung lung hang cong dan than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu van)) - thanh trung lung hang cong dan than cap*.