Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
lam duoc » nam duoc, luat duoc, lam thuoc
tang tai » hang tai, dung tai, sang tao
tai khoi » tai khoa, mai khoi, tao khoi
duoc va » nuoc va, duc va, duoc ma
van lam » van nam
sang ky » sang kyo, dang ky, tang ky
cua tre » cua te, cuu tre, cua triet
ban ky » dan ky
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: phi ((((van ky) or (ban ky))) or (sang ky)) tang tai khoi. hieu van lam duoc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phi ((((van ky) OR (ban ky))) OR (sang ky)) tang tai khoi. hieu van lam duoc va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: phi ((((van ky) or (ban ky))) or (sang ky)) tang tai khoi. hieu van lam duoc va thanh vi cua tre*.