Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
lang van » dang van, tang van, hoang van
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cac toc » cac toi, cac nuoc, cac thoi
vai cua » dai cua, hai cua, lai cua
cac loc » cac lop, cac hoc, cac nuoc
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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 sac ky ((nang x) OR (lang van)) hoi. hieu van ((cac loc) OR (cac toc)) va thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang x) or (lang van)) hoi. hieu van ((cac loc) OR (cac toc)) va thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang x) or (lang van)) hoi. hieu van ((cac loc) OR (cac toc)) va thanh vai cua tre*.