Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong, khien vong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh dang » hanh dong, anh dang, hanh dung
dang van » hoang van, hang va
van dung » van dong, xay dung, tin dung
dung ung » dung cong
van phan » van phong, van thanh, luan phan
ung van » dung van, vung van, cung van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((khien bang) or (chieu sang)) - hanh dang van dung ung van phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((khien bang) OR (chieu sang)) - hanh dang van dung ung van phan tu.
• Adding a wildcard symbol may retrieve word variants: theo ((khien bang) or (chieu sang)) - hanh dang van dung ung van phan tu*.