Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac
luc va » tuc va, loc va
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) y nang x hoi. hieu ve cau ((luc va) or (duc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) y nang x hoi. hieu ve cau ((luc va) OR (duc va)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) y nang x hoi. hieu ve cau ((luc va) or (duc va)) hanh di cua tre*.