Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » nhieu tang, hieu van, biet lang
trung kha » trung khoa, trung ha, truong khoa
dung cong » dung trong
kha dung » khoa dung, khao dung, nha dung
cong bai » cuong bai, cong hai, cung bai
bai van » bui van, hai van, mai van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((((chieu sang) OR (hieu lang))) or (hieu quang)) - thanh trung kha dung cong bai van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((chieu sang) OR (hieu lang))) OR (hieu quang)) - thanh trung kha dung cong bai van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((((chieu sang) OR (hieu lang))) or (hieu quang)) - thanh trung kha dung cong bai van ban*".