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 ngang » cong nhan, cong quang, cong lang
ngang dang » ngan hang, nhan dang, ngan danh
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
dang bang » dong bang, dang dang, tang bang
cua dung » cua dang, cua dong, qua dung

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 cong ngang 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 cong ngang dang bang.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thien quan)) - thanh trung cua dung cong ngang dang bang*.