Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong, khien vong
chieu sang » chieu sach, chieu xanh, hieu lang
dung phung » dung phuong, dung chung, dung nhung
hanh dang » hanh dong, anh dang, hanh dung
dang xay » dang van, van xay
van phan » van phong, van thanh, luan phan

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