Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
luu tre » luu tru, cuu tre
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
luy tre » luyen tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang xa hoi. ((hieu ve) or (hieu va)) cao duc va hanh vi ((luu tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. ((hieu ve) OR (hieu va)) cao duc va hanh vi ((luu tre) OR (luy tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. ((hieu ve) or (hieu va)) cao duc va hanh vi ((luu tre) or (luy tre))*.