Perhaps you should try some spelling variations:
thieu nien » thien nhien
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nien cac » vien cac, dien cac, bien cac
thu sach » tu sach, thuat sach, thuoc sach
tay hoi » tay ho, tao hoi, tay thai
va danh » va dinh, va dan, va hanh
xay hoi » xa hoi, cay phoi, gay thoi
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ 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 ((xay hoi) or (tay hoi)). thieu nien cac nuoc ((va danh) or (van hanh)) dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y dang ((xay hoi) OR (tay hoi)). thieu nien cac nuoc ((va danh) OR (van hanh)) dan cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y dang ((xay hoi) or (tay hoi)). thieu nien cac nuoc ((va danh) or (van hanh)) dan cua tre*.