Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
vu nang » vuc nang, va nang, vu dang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua
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: ((toc sach) OR (thuoc sach)) vu nang x hoi. hieu ve cam ((tuc va) OR (duc va)) hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) vu nang x hoi. hieu ve cam ((tuc va) or (duc va)) hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) vu nang x hoi. hieu ve cam ((tuc va) or (duc va)) hanh di cua tre*.