Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
o hoi » co hoi, o hoc, o hoa
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: thu sach ky nang ((xa hoi) or (((o hoi) or (o hai)))). hieu va cam xuc va thanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((xa hoi) OR (((o hoi) OR (o hai)))). hieu va cam xuc va thanh dan cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((xa hoi) or (((o hoi) or (o hai)))). hieu va cam xuc va thanh dan cua tre*.