Perhaps you should try some spelling variations:
sang tao » hang tai
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
sang tai » hang tai, tang tai, sang than
hieu van » hieu va, thien van, lieu va
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
cua tre » cua te, cuu tre, cua triet
ban ky » van ky
dan ky » van ky
vi cua » vai cua, di cua

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: phu ((ban ky) OR (dan ky)) ((sang tai) OR (sang tao)) hoi. hieu van lam duc va thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "phu ((ban ky) or (dan ky)) ((sang tai) OR (sang tao)) hoi. hieu van lam duc va thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: phu ((ban ky) or (dan ky)) ((sang tai) OR (sang tao)) hoi. hieu van lam duc va thanh vi cua tre*.