Perhaps you should try some spelling variations:
cham doc » cham soc, chat doc, chau doc
cuu tre » cau tren, cau treo
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cua triet, dua tren
doan vi » doan va, don vi, doan thi
tu san » thu san, tu ban, tu can
dan vi » don vi, dan va, gan vi
san ky » sang ky, van ky, dan ky
doc va » duoc va, hoc va, duc va

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 lang xa hoi. hieu ve cham doc 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 san ky lang xa hoi. hieu ve cham doc 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 san ky lang xa hoi. hieu ve cham doc va ((dan vi) OR (doan vi)) ((cua tre) or (cuu tre))*".