Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
nhan duc » nhan duoc, nhan luc, phan duc
duc ban » duc tan, duc van, dua ban
hieu ca » hieu cac, hieu cua, hieu va
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ca nhan duc ban hanh vi ((va triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang ma)) hoi. hieu ca nhan duc ban hanh vi ((va triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ca nhan duc ban hanh vi ((va triet) or (su viet))*.