Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
bien cac » vien cac, dien cac, bien ca
nien cac » vien cac, dien cac, hien cac
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
xuc va » duc va, tuc va, luc 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) OR (bien cac)) xuc va hanh tai ((su tien) 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) OR (bien cac)) xuc va hanh tai ((su tien) 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) OR (bien cac)) xuc va hanh tai ((su tien) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. thieu ((nien cac) OR (bien cac)) xuc va hanh tai ((su tien) or (va thiet))*.