Perhaps you should try some spelling variations:
cham loc » chon loc, cham o, hau loc
dua tren » dung tren
cuu tre » cua tre, cau tren, cau treo
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
dau vi » dau ve, dau va, dat vi
tu san » thu san, tu ban, tu can
va dau » va dao
san ky » sang ky, van ky, dan ky

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