Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
du chat » duoc chat, dung chat, doc chat
hanh di » hanh vi, hanh de, hang di
huu van » cuu van, huu han, luu van
cua tre » cua te, cuu tre, cua triet
vu chat » va chat, ve chat, vu cham
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: ((tu cach) or (thuoc sach)) ky nang x hoi. hieu ((vu chat) OR (du chat)) huu van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuoc sach)) ky nang x hoi. hieu ((vu chat) OR (du chat)) huu van hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuoc sach)) ky nang x hoi. hieu ((vu chat) OR (du chat)) huu van hanh di cua tre*".