Perhaps you should try some spelling variations:
thang long » thanh cong
long thuc » luong thuc, long thuoc, cong thuc
cong phan » cong nhan, cong khan, chong phap
phan phan » phap phan, phan phat, than phan
doc hieu » hoc thieu, hoc hien
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: ((doc hieu) or (toc thieu)) sach - thang long thuc dan cong phan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sach - thang long thuc dan cong phan phan tu.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) sach - thang long thuc dan cong phan phan tu*.