Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
nhan luc » nang luc
su triet » su viet, su tien, ve triet
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
va nhan » van nhan, ca nhan, va phan
luc ban » duc ban, cuc ban, luc bat
lang xa » lang ha, dang xay
hieu va » lieu va, hieu qua

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