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