Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
danh trung » dang trung, dinh trung, manh trung
khong cong » thong cong, khong cang, chong cong
hoc thieu » toc thieu, hoc hien
hua khong » hoa khong, cua khong, hoac khong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than tap » toan tap, han tap, phan tap

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 - ((danh trung) or (thanh trung)) hua khong cong tan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((danh trung) OR (thanh trung)) hua khong cong tan than tap*.