Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
ca tren » cau tren, cu tren, la tren
sang ky » sang kyo, dang ky, tang ky
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
loc va » hoc va
luc va » duc va, tuc va
san ky » van ky, dan ky, ban ky
va cam » va cham, va cac, va cao
vi ca » vit ca, li ca, va ca

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)) tang xa hoi. hieu va cam ((luc va) or (loc va)) thanh vi ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) tang xa hoi. hieu va cam ((luc va) OR (loc va)) thanh vi ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) tang xa hoi. hieu va cam ((luc va) or (loc va)) thanh vi ca tren".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) tang xa hoi. hieu va cam ((luc va) or (loc va)) thanh vi ca tren*.