Perhaps you should try some spelling variations:
thong hoang » phuong hoang, thong thong, khung hoang
canh thanh » canh tranh, danh thanh, nhanh thanh
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
anh thanh » danh thanh, nhanh thanh, thanh thanh
van thong » van thuong, van phong, va thong
hoang van » hang va
van thanh » ban thanh, van tuan
thanh tap » thanh lap, thanh tai, thanh tay

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (hieu lang)) - ((canh thanh) or (anh thanh)) van thong hoang van thanh tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - ((canh thanh) OR (anh thanh)) van thong hoang van thanh tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - ((canh thanh) or (anh thanh)) van thong hoang van thanh tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - ((canh thanh) or (anh thanh)) van thong hoang van thanh tap*.