Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
tai roi » lai roi, tai hoi, tai loi
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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 y nang tai roi. hieu ((ve cam) or (ve cac)) luc va vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang tai roi. hieu ((ve cam) OR (ve cac)) luc va vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang tai roi. hieu ((ve cam) or (ve cac)) luc va vanh dai cua tre*.