Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
phan tin » phan tien, phan tan, phan tieng
dung ung » dung cong
van phan » van phong, van thanh, luan phan
phan cap » phan lap, phan tap, phan cac
ung hat » dung chat, dung nhat, hung phat
hat van » hoat van, ha van, hai van

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)) sach - phan tin dung ung hat van phan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - phan tin dung ung hat van phan cap.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - phan tin dung ung hat van phan cap*.