Perhaps you should try some spelling variations:
thieu nien » thien nhien
thu sach » tu sach, thuat sach, thuoc sach
nien coc » nien cong, vien cac, dien cuc
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va dung » van dung, va duong, vat dung
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. thieu nien coc luc va dung tai ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. thieu nien coc luc va dung tai ((su triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. thieu nien coc luc va dung tai ((su triet) or (va thiet))*.