Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
may hoi » may thoi, tay hoi, mai hoi
dau cua » dai cua, day cua, cau cua
te sach » toc sach
y mang » cay mang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y mang may hoi. hieu ve ((cham tuc) OR (tham thuc)) ((va danh) OR (va dinh)) dau cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y mang may hoi. hieu ve ((cham tuc) OR (tham thuc)) ((va danh) or (va dinh)) dau cua viet~".
• Adding a wildcard symbol may retrieve word variants: te sach y mang may hoi. hieu ve ((cham tuc) OR (tham thuc)) ((va danh) or (va dinh)) dau cua viet*.