Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong thuc » cong tac
thuc phan » thuc pham, thu phan, thuc chan
phan phan » phap phan, phan phat, than phan
phan lap » phan dau
phan da » phan dau, phan dai, phan day
da dung » dan dung, dat dung, da dang

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