Perhaps you should try some spelling variations:
thuc chung » thuc cung, thuc nhung, thung chung
chung cong » nhung cong, chong cong, phung cong
cong thuc » cong tac
cong lang » cong vang, cong luong, cong quang
lang phan » nang phan, lang thang, lang phong
ho chieu » theo chieu, hoc thieu, mot chieu
phan dau » phan tu, hang dau

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 - thanh cong thuc chung cong lang phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (toc thieu)) sach - thanh cong thuc chung cong lang phan dau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (toc thieu)) sach - thanh cong thuc chung cong lang phan dau*.