Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
dan danh » van danh, han danh, ban danh
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
su sach » vu sach
danh di » danh du, xanh di, danh dien
so sach » so sanh, bo sach, co sach
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va
di hoa » dai hoa, doi hoa, do hoa

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: ((su sach) OR (so sach)) ty xang xa hoi. ((hieu ve) OR (hieu van)) tham thuc dan danh di hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty xang xa hoi. ((hieu ve) or (hieu van)) tham thuc dan danh di hoa viet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty xang xa hoi. ((hieu ve) or (hieu van)) tham thuc dan danh di hoa viet*.