Perhaps you should try some spelling variations:
thanh long » thanh cong, thang long, thanh huong
doi chieu » doc hieu, doi chi, mot chieu
long thuc » luong thuc, long thuoc, cong thuc
cong khan » cong khanh, cong nhan, cong phan
khan phan » than phan, khan than, phan phan
thuc dan » thuc hanh, hoc dan, thuc vat
dan cong » dang cong, van cong, dan dong

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