Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
cac tao » cau tao, cac tro, cac tac
via cua » gia cua, gian cua, giau cua
va dan » ca dan, va dao, va dau
va cua » va chua, ca cua, ma cua
x hoi » xa hoi, o hoi, x ho

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

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