Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hoc thieu » toc thieu, hoc hien
cong thuc » cong tac
thuc dung » thuoc dung, thuy dung, tuc dung
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
lang phan » nang phan, lang thang, lang phong

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 (hoc thieu)) sach - thanh cong thuc dung cong lang phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) sach - thanh cong thuc dung cong lang phan tu.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) sach - thanh cong thuc dung cong lang phan tu*.