Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cuu tre » cau tren, cau treo
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cua triet, dua tren
doan vi » doan va, don vi, doan thi
tu ban » thu ban, te ban
ban ky » van ky, dan ky
soc va » hoc va, loc va, doc va
dan vi » don vi, dan va, gan vi

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

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