Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
vu nang » vuc nang, va nang, vu dang
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
huu tre » huu tri, cuu tre, huu them
v nang » va nang, van nang, voi nang
ve cao » va cao, ve bao, ve cac
va anh » van anh, va danh, va hanh
anh va » hanh va
va huu » vu huu
x hoi » xa hoi, o hoi, x ho

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 ((v nang) or (vu nang)) x hoi. hieu ve cao duc va anh va huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (vu nang)) x hoi. hieu ve cao duc va anh va huu tre*.