Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
doc hieu » hoc thieu, hoc hien
dang van » hoang van, hang va
van dung » van dong, xay dung, tin dung
dung dat » dung va, dung tai
va tan » van tan, va toan, va than
tan ca » tan cua, tang ca, dan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) tinh - phan dang van dung dat va tan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - phan dang van dung dat va tan ca.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - phan dang van dung dat va tan ca*.