Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
phan dan » phan dang, phan dau, nhan dan
dan dung » van dung, tin dung, ap dung
van chat » cao chat
lang va » lang van, hang va, lang ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) tinh - phan dan dung cong lang va van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) tinh - phan dan dung cong lang va van chat.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) tinh - phan dan dung cong lang va van chat*.