Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
cong thuc » cong tac
thuc dang » thuoc dang, thuc dan, thuc dung
dang cong » dung cong
cong lang » cong vang, cong luong, cong quang
lang phan » nang phan, lang thang, lang phong
phan lap » phan 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 thuc dang cong lang phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - thanh cong thuc dang cong lang phan lap.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - thanh cong thuc dang cong lang phan lap*.