Perhaps you should try some spelling variations:
cham doc » cham soc, chat doc, chau doc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
lang xa » lang ha, dang xay, lang van
sang ky » sang kyo, dang ky, tang ky
san ky » van ky, dan ky, ban ky
doc va » duoc va, hoc va, duc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan 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) OR (sang ky)) lang xa hoi. hieu ve cham doc va dan vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) lang xa hoi. hieu ve cham doc va dan vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) lang xa hoi. hieu ve cham doc va dan vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) lang xa hoi. hieu ve cham doc va dan vi ((cua tre) or (cuu tre))*.