Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
te sach » toc sach
hanh de » hanh ve, hanh kem
tuc van » thuc van, truc van, duc van
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 thue nang ((x hoi) OR (o hoi)). hieu va cam ((tuc van) OR (tuc va)) hanh de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thue nang ((x hoi) OR (o hoi)). hieu va cam ((tuc van) or (tuc va)) hanh de cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach thue nang ((x hoi) OR (o hoi)). hieu va cam ((tuc van) or (tuc va)) hanh de cua tre*.