Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
van cham » van chat, van tham, van pham
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
tu sang » thu sang, tu san, tu lang
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
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: tu sang ky ((lang xa) or (lang van)) hoi. hieu ((van cham) OR (va cham)) duc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang ky ((lang xa) OR (lang van)) hoi. hieu ((van cham) OR (va cham)) duc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sang ky ((lang xa) or (lang van)) hoi. hieu ((van cham) OR (va cham)) duc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sang ky ((lang xa) or (lang van)) hoi. hieu ((van cham) OR (va cham)) duc van hanh vi cua tre*.