Perhaps you should try some spelling variations:
thieu nien » thien nhien
cac giai » tac gia, cuu giai, hoc giai
nien cac » vien cac, dien cac, bien cac
hai cua » thai cua, dai cua, hoi cua
va nang » van nang, da nang, cam nang
va lang » hoa lang
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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