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