Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien coc » nien cong, vien cac, dien cuc
nang tai » hang tai, tang tai, sang tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
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: tu sach ky nang xa hoi. thieu nien coc luc va nang tai ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thieu nien coc luc va nang tai ((su triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thieu nien coc luc va nang tai ((su triet) or (va thiet))*.