Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
thien quan » trien quang, lien quan, thien van
cong vang » cong lang, cong quang, cong ngang
vang dang » van dang, dang dang, hoang dang
dang bang » dong bang, dang dang, tang bang
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang

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) or (thien quan)) - thanh trung ((cua dung) OR (cua dong)) cong vang dang bang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thien quan)) - thanh trung ((cua dung) OR (cua dong)) cong vang dang bang.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thien quan)) - thanh trung ((cua dung) OR (cua dong)) cong vang dang bang".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thien quan)) - thanh trung ((cua dung) OR (cua dong)) cong vang dang bang*.