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

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