Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
dong phong » duong phong, dong phuong, hong phong
dong thong » thong thong, nong thon, dong thanh
hieu lang » hieu quang, nhieu tang, hieu van
doanh cua » doanh luan
toan tap » toan ban
va toan » van toan, bai toan, tap toan

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

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