Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach tu » sach thu, cach tu, sach ty
va cham » va chat, va tham
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
cuu va » cuu van, cuu ve
vi cua » vai cua, di cua
cu va » tu va, su va, vu va

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 tu nang ((ma hoi) or (xa hoi)). lieu va cham ((cu va) or (cuu va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu nang ((ma hoi) OR (xa hoi)). lieu va cham ((cu va) OR (cuu va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach tu nang ((ma hoi) or (xa hoi)). lieu va cham ((cu va) or (cuu va)) hanh vi cua tre*.