Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh ve » thanh va, thanh vien, thanh van
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va, hanh kem
te san » te ban, ke san, tu san
tuc va » thuc va, truc va, tuc xa
san ky » sang ky, van ky, dan ky
luc va » duc va, loc va
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky tang xa hoi. hieu va cam ((luc va) OR (tuc va)) ((thanh ve) or (hanh ve)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky tang xa hoi. hieu va cam ((luc va) OR (tuc va)) ((thanh ve) OR (hanh ve)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky tang xa hoi. hieu va cam ((luc va) OR (tuc va)) ((thanh ve) or (hanh ve)) cau tren".
• Adding a wildcard symbol may retrieve word variants: te san ky tang xa hoi. hieu va cam ((luc va) OR (tuc va)) ((thanh ve) or (hanh ve)) cau tren*.