Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua viet » ca viet, hoa viet, cua vat
nien cac » vien cac, dien cac, bien cac
dang xay » dang van, van xay
lang xa » lang ha, lang van
vu sach » vu bach, su sach, vu khach
cac tao » cau tao, cac tro, cac tac
tu sach » thu sach, su sach, te sach
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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