Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ca » hieu cac, hieu cua, hieu va
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
hang vi » hang va, hanh vi, hang di

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