Perhaps you should try some spelling variations:
thien van » thi van
tham thuc » nham thuc, pham thuc, tam thuc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
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 ty xang xa hoi. ((hieu ve) OR (thien van)) tham thuc va danh di hoa viet~.
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. ((hieu ve) or (thien van)) tham thuc va danh di hoa viet*.