Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
via cua » gia cua, gian cua, giau cua
va cua » va chua, ca cua, ma cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky lang) OR (ky dang)) xa hoi. thieu nien cac nuoc va thanh ((va cua) OR (via cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky lang) or (ky dang)) xa hoi. thieu nien cac nuoc va thanh ((va cua) OR (via cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky lang) or (ky dang)) xa hoi. thieu nien cac nuoc va thanh ((va cua) OR (via cua)) tre*.