Perhaps you should try some spelling variations:
thien van » thi van
cach thuc » anh thuc, cac thu
hieu van » hieu va, lieu va, hieu ve
su sach » so sach, vu sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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 sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cach thuc va danh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cach thuc va danh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cach thuc va danh di cua tre*.