Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
vi cua » vai cua, di cua
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((lang xa) or (tang van)) hoi. hieu ((ve cham) OR (vu cham)) duc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((lang xa) OR (tang van)) hoi. hieu ((ve cham) OR (vu cham)) duc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((lang xa) or (tang van)) hoi. hieu ((ve cham) OR (vu cham)) duc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((lang xa) or (tang van)) hoi. hieu ((ve cham) OR (vu cham)) duc van hanh vi cua tre*.