Perhaps you should try some spelling variations:
thieu nien » thien nhien
hanh vai » hanh vi, hanh va, hanh tai
nien cac » vien cac, dien cac, bien cac
cac truc » cau truc, cac tru, cac trung
su triet » su viet, ve triet
tu sach » thu sach, su sach, te sach
su tien » su kien, su hien, tu tieng
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma

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 ky nang xa hoi. thieu nien cac truc va hanh vai ((((su triet) or (su tien))) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thieu nien cac truc va hanh vai ((((su triet) OR (su tien))) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thieu nien cac truc va hanh vai ((((su triet) or (su tien))) or (va thiet))*.