Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
cua tre » cua te, cuu tre, cua triet
danh vi » dinh vi, danh di, danh va
cuu ban » cuu van, cua ban, cuu san
cam cuu » cham cuu, cap cuu
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
sang ky » sang kyo, dang ky, tang ky
san ky » van ky, dan ky, ban ky
ve cam » ve cham, ve cac, va cam

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) OR (sang ky)) lang van hoi. hieu ve cam cuu ban ((danh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) lang van hoi. hieu ve cam cuu ban ((danh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) lang van hoi. hieu ve cam cuu ban ((danh vi) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) lang van hoi. hieu ve cam cuu ban ((danh vi) or (hanh vi)) cua tre*.