Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham soc » cham soc, tham nuoc, thai son
lang xa » lang ha, lang van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
soc va » hoc va, loc va, doc va
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: te cac ky ((lang xa) or (dang xay)) hoi. hieu van tham soc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((lang xa) OR (dang xay)) hoi. hieu van tham soc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te cac ky ((lang xa) or (dang xay)) hoi. hieu van tham soc va hanh vi cua tre*.