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