Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
ca tren » cau tren, cu tren, la tren
hieu va » lieu va
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
san ky » sang ky, van ky, dan ky
luc va » duc va, tuc va
loc va » hoc va
tu san » thu san, tu ban, tu can
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 tang xa hoi. ((hieu va) OR (hieu qua)) 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 tang xa hoi. ((hieu va) OR (hieu qua)) 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 tang xa hoi. ((hieu va) OR (hieu qua)) cam ((luc va) or (loc va)) thanh vi ca tren".
• Adding a wildcard symbol may retrieve word variants: tu san ky tang xa hoi. ((hieu va) OR (hieu qua)) cam ((luc va) or (loc va)) thanh vi ca tren*.