Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
van thanh » ban thanh, van tuan
dan than » dan chan, ban than, van than

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 cua thong cong ((dan than) or (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung cua thong cong ((dan than) OR (van thanh)) cau*.