Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
thuc ban » thuoc ban, thuc dan, thu ban
ban hang » ngan hang
cua viet » hoa viet, cua vat, cua dieu
so sach » so sanh, bo sach, co sach
may hoi » may thoi, tay hoi, mai hoi
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
ca viet » va viet, co viet, hoa viet
y mang » cay mang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y mang may hoi. hieu van cau thuc ban hang va ((cua tre) or (((cua viet) OR (ca viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y mang may hoi. hieu van cau thuc ban hang va ((cua tre) OR (((cua viet) OR (ca viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y mang may hoi. hieu van cau thuc ban hang va ((cua tre) or (((cua viet) OR (ca viet))))".
• Adding a wildcard symbol may retrieve word variants: so sach y mang may hoi. hieu van cau thuc ban hang va ((cua tre) or (((cua viet) OR (ca viet))))*.