Perhaps you should try some spelling variations:
thieu nien » thien nhien
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh tai, hanh van
nien cac » vien cac, dien cac, bien cac
cac duc » cac du, cao duc, cac dac
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach

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