Perhaps you should try some spelling variations:
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
cau tre » cau tren, cau treo, cau tra
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
va cau » van cau, va cac, va dau
loc va » hoc va, luc va
di cau » da cau, diem cau

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 cau ((loc va) or (duc va)) hanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky tang xa hoi. hieu va cau ((loc va) OR (duc va)) hanh di cau tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky tang xa hoi. hieu va cau ((loc va) or (duc va)) hanh di cau tre*.