Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang ((x hoi) OR (xa hoi)). lieu va cham ((goc va) or (loc va)) hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((x hoi) OR (xa hoi)). lieu va cham ((goc va) OR (loc va)) hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((x hoi) OR (xa hoi)). lieu va cham ((goc va) or (loc va)) hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((x hoi) OR (xa hoi)). lieu va cham ((goc va) or (loc va)) hanh doi cua tre*.