Perhaps you should try some spelling variations:
dang xay » dang van, van xay
tham soc » cham soc, tham nuoc, thai son
lang xa » lang ha, lang van
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 sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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 sac ky ((lang xa) OR (dang xay)) hoi. hieu va tham soc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) OR (dang xay)) hoi. hieu va tham soc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) OR (dang xay)) hoi. hieu va tham soc va hanh vi cua tre*.