Perhaps you should try some spelling variations:
chat long » chat luong, hai long, ha long
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van chat » cao chat
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
ky dang » ky nang, ky danh
long va » luong va, long van, blong va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y dang » 2 dang, _ dang, b dang

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 ((y dang) OR (ky dang)) ((xay hoi) or (tay hoi)). hieu van chat long va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y dang) OR (ky dang)) ((xay hoi) OR (tay hoi)). hieu van chat long va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y dang) OR (ky dang)) ((xay hoi) or (tay hoi)). hieu van chat long va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y dang) OR (ky dang)) ((xay hoi) or (tay hoi)). hieu van chat long va hanh vai cua tre*.