Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
va nhan » van nhan, ca nhan, va phan
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
su tien » su kien, su hien, tu tieng
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. lieu va nhan ((luc van) OR (duc van)) hanh vi ((va triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. lieu va nhan ((luc van) OR (duc van)) hanh vi ((va triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. lieu va nhan ((luc van) OR (duc van)) hanh vi ((va triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. lieu va nhan ((luc van) OR (duc van)) hanh vi ((va triet) or (su tien))*.