Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dang cong » dung cong
cong nang » cong ngang, cong lang, cong nong
nang phat » nang suat, van phat
cong va » dong va, cong ha, cong tac
va dang » van dang, va nang, va lang
phat tu » phan tu, pham tu, phap tu

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