Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
cau thuc » cau truc, cuu thuc, can thuc
danh lai » danh sai, gianh lai, dinh lam
vu sach » vu bach, su sach, vu khach
bo sach » co sach, hoc sach
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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: ((vu sach) OR (bo sach)) y nang x hoi. ((hieu van) OR (lieu va)) cau thuc va danh lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (bo sach)) y nang x hoi. ((hieu van) OR (lieu va)) cau thuc va danh lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (bo sach)) y nang x hoi. ((hieu van) OR (lieu va)) cau thuc va danh lai cua tre*.