Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
bat hanh » bat khanh, ban hanh, bao hanh
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
va nhan » van nhan, ca nhan, va nha
va phan » van phan, va phat, va phap
luc bat » suc bat, luc nhat, luat bat
su viet » so viet
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) OR (va phan)) luc bat hanh vi ((va triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. lieu ((va nhan) OR (va phan)) luc bat hanh vi ((va triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. lieu ((va nhan) OR (va phan)) luc bat hanh vi ((va triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. lieu ((va nhan) OR (va phan)) luc bat hanh vi ((va triet) or (su viet))*.