Perhaps you should try some spelling variations:
dang xay » dang van, van xay
mang xa » lang xa, mang may, mang cua
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
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
ve cac » va cac, vien cac
loc va » hoc va, luc 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 ((mang xa) or (dang xay)) hoi. hieu ve cac loc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((mang xa) OR (dang xay)) hoi. hieu ve cac loc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((mang xa) or (dang xay)) hoi. hieu ve cac loc va hanh vi cua tre*.