Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
cac tao » cau tao, cac tro, cac tac
va chua » vua chua, ca chua, va chu
va dan » ca dan, va dao, va dau
va cua » via cua, ca cua, ma cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (vu sach)) ky nang xa hoi. thieu nien cac tao va dan ((va cua) OR (va chua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang xa hoi. thieu nien cac tao va dan ((va cua) OR (va chua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) ky nang xa hoi. thieu nien cac tao va dan ((va cua) OR (va chua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang xa hoi. thieu nien cac tao va dan ((va cua) OR (va chua)) triet*.