Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
su triet » su viet, su tien, ve triet
sach ty » sach y, sach tu, sach thu
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
luc ban » duc ban, cuc ban, luc bat

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