Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong thuc » cong tac
thuc thcs » thuc thai, thuc thuc, thuc thi
thcs phan » than phan, thu phan, thai phan
van dung » van dong, xay dung, tin dung
phan cap » phan lap, phan tap, phan cac

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 - pham van dung cong thuc thcs phan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (toc thieu)) sach - pham van dung cong thuc thcs phan cap".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (toc thieu)) sach - pham van dung cong thuc thcs phan cap*.