Perhaps you should try some spelling variations:
thai son » thai den, thai do, thai hoc
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
hieu va » lieu va
lang xa » lang ha, lang van
son va » song va, son la, lon va
vi cua » vai cua, di cua
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve cac ky ((lang xa) or (dang xay)) hoi. ((hieu va) or (hieu qua)) thai son va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve cac ky ((lang xa) OR (dang xay)) hoi. ((hieu va) OR (hieu qua)) thai son va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ve cac ky ((lang xa) or (dang xay)) hoi. ((hieu va) or (hieu qua)) thai son va hanh vi cua tre*.