Perhaps you should try some spelling variations:
dang cong » dung cong
cong thuc » cong tac
thuc phan » thuc pham, thu phan, thuc chan
phan than » phan thanh, phan tan, khan than
ho chieu » theo chieu, hoc thieu, mot chieu
nhan dan » phan dau, gian dan, nhan tai
dan dang » dang dang, dan dung, da dang
than cap » khan cap, thanh lap, thanh cac

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 - nhan dan dang cong thuc phan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (toc thieu)) sach - nhan dan dang cong thuc phan than cap.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (toc thieu)) sach - nhan dan dang cong thuc phan than cap*.