Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
hang vi » hang va, hanh vi, hang di
cau tra » ca tra, cau ra, cau truc
ban ky » dan ky
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 ((ban ky) OR (van ky)) nang x hoi. hieu van cau ((luc va) OR (tuc va)) hang vi cau tra~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((ban ky) OR (van ky)) nang x hoi. hieu van cau ((luc va) or (tuc va)) hang vi cau tra~".
• Adding a wildcard symbol may retrieve word variants: tu ((ban ky) OR (van ky)) nang x hoi. hieu van cau ((luc va) or (tuc va)) hang vi cau tra*.