Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
ban hang » ngan hang
nhan luc » nang luc
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
luc ban » duc ban, cuc ban, luc bat
lang xa » lang ha, dang xay, lang van
hang vi » hang va, hanh vi, hang di
va nhan » van nhan, ca nhan, va phan

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

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