Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
luc ban » cuc ban, luc bat, luc van
duc ban » duc tan, duc van, dua ban
su tien » su kien, su hien, tu tieng

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) or (su tien))*.