Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
luc van » luoc van, luu van, duc van
vu cham » va cham, vu kham, tu cham
mang xa » lang xa, mang may, mang cua
san ky » sang ky, van ky, dan ky
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((mang xa) or (dang xay)) hoi. hieu ((ve cam) or (vu cham)) luc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((mang xa) OR (dang xay)) hoi. hieu ((ve cam) OR (vu cham)) luc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky ((mang xa) or (dang xay)) hoi. hieu ((ve cam) or (vu cham)) luc van hanh vi cua tre*.