Perhaps you should try some spelling variations:
phan dung » phan ung, phan dang, chan dung
cong thuc » cong tac
thuc phan » thuc pham, thu phan, thuc chan
ho chieu » theo chieu, hoc thieu, mot chieu
dung dat » dung va, dung tai
dat cong » dai cong, dam cong, bat cong
phan dan » phan dang, phan dau, nhan dan
dan lap » phan lap, dan luan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (toc thieu)) sach - phan dung dat cong thuc phan dan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (toc thieu)) sach - phan dung dat cong thuc phan dan lap.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (toc thieu)) sach - phan dung dat cong thuc phan dan lap*.