Perhaps you should try some spelling variations:
phan cong » thanh cong
cong thuc » cong tac
thuc phan » thuc pham, thu phan, thuc chan
ho chieu » theo chieu, hoc thieu, mot chieu
cong dan » cong san, cong tan, huong dan
dan cong » dang cong, van cong, dan dong
phan tan » phan van, phan tap, phan lan
tan ca » tan cua, tang ca, dan ca

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