Perhaps you should try some spelling variations:
thieu nien » thien nhien
thu sach » tu sach, thuat sach, thuoc sach
nien cac » vien cac, dien cac, bien cac
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho

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 x hoi. thieu nien cac ((xuc va) OR (duc va)) hanh tai ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. thieu nien cac ((xuc va) OR (duc va)) hanh tai ((su triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. thieu nien cac ((xuc va) OR (duc va)) hanh tai ((su triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. thieu nien cac ((xuc va) OR (duc va)) hanh tai ((su triet) or (va thiet))*.