Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh dong » anh dong, ha dong
dong thai » duong thai, dong tai, cong thai
thai sinh » thai binh, phai sinh, tai sinh
sinh cong » minh cong, trinh cong, chinh cong
phan chat » phan phat, phap chat, nhan chat
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan

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 - hanh dong thai sinh cong tan phan chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - hanh dong thai sinh cong tan phan chat*.