Perhaps you should try some spelling variations:
nam truc » nam truoc, nam thuc, nam trung
vanh dai » van dai, vanh tai, lanh dao
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach v nang ((x hoi) or (o hai)). hieu ve nam truc va vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v nang ((x hoi) OR (o hai)). hieu ve nam truc va vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach v nang ((x hoi) or (o hai)). hieu ve nam truc va vanh dai cua tre*.