Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
hieu va » lieu va, hieu qua
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
bai ky » sai ky, bac ky, dai ky
ban ky » van ky, dan ky
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
luc va » tuc va, loc va
o hai » co hai, so hai, o lai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((bai ky) OR (ban ky)) nang o hai. hieu va cam ((luc va) OR (duc va)) hang tai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bai ky) OR (ban ky)) nang o hai. hieu va cam ((luc va) or (duc va)) hang tai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((bai ky) OR (ban ky)) nang o hai. hieu va cam ((luc va) or (duc va)) hang tai cuu tre*.