Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hang cong » dang cong, hang nong, bang cong
cong nang » cong ngang, cong lang, cong nong
nang phan » nang phat, nang thanh, nang quan
cong tac » cong ty
tac hang » tac vang, bac thang, tac chong
phan dau » phan tu, hang dau

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 - thanh cong tac hang cong nang phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - thanh cong tac hang cong nang phan dau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - thanh cong tac hang cong nang phan dau*.