Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong, khien vong
dung chung » dung cong, dung ung, dung trung
hieu lang » chieu sang, hieu quang, nhieu tang
hanh dang » hanh dong, anh dang, hanh dung
chung van » phung van, nhung van, chung han
dang van » hoang van, hang va
van dung » van dong, xay dung, tin dung
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 (hieu lang)) - hanh dang van dung chung van phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((khien bang) OR (hieu lang)) - hanh dang van dung chung van phan tu.
• Adding a wildcard symbol may retrieve word variants: theo ((khien bang) or (hieu lang)) - hanh dang van dung chung van phan tu*.