Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
va nang » van nang, da nang, cam nang
luc ban » duc ban, cuc ban, luc bat
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) OR (sach ty)) nang xa hoi. hieu va nang 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) OR (sach ty)) nang xa hoi. hieu va nang 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) OR (sach ty)) nang xa hoi. hieu va nang luc ban hanh vi ((va triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu va nang luc ban hanh vi ((va triet) or (su triet))*.