Perhaps you should try some spelling variations:
thieu nien » thien nhien
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
thu sach » thuat sach, thuoc sach, thu hoach
nien cac » vien cac, dien cac, bien cac
tu sach » su sach, te sach, tu cach
cac toc » cac toi, cac nuoc, cac thoi
nang xa » nang x, lang xa, mang xa
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
toc va » hoc va, toc ta, tuc va
cua te » cua tu

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: ((tu sach) OR (thu sach)) ky ((nang xa) OR (nang ma)) hoi. thieu nien cac toc va hanh than cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky ((nang xa) OR (nang ma)) hoi. thieu nien cac toc va hanh than cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky ((nang xa) OR (nang ma)) hoi. thieu nien cac toc va hanh than cua te*.