Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
va nang » van nang, da nang, cam nang
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
y nang » ky nang, ly nang, v nang
hai su » hai vu, lai su, tai su
hai so » dai so, tai so, thai son

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (va nang)) xa hoi. hieu van cau thuc va thanh ((hai su) OR (hai so)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (va nang)) xa hoi. hieu van cau thuc va thanh ((hai su) OR (hai so)) triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (va nang)) xa hoi. hieu van cau thuc va thanh ((hai su) OR (hai so)) triet*.