Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
anh sang » lanh sang, anh dang, anh nang
anh bang » anh hoang, anh quang, tinh bang
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((anh sang) OR (anh bang)) cua ((nhung cong) OR (dung cong)) dan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((anh sang) or (anh bang)) cua ((nhung cong) OR (dung cong)) dan toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((anh sang) or (anh bang)) cua ((nhung cong) OR (dung cong)) dan toan ban*.