Perhaps you should try some spelling variations:
hanh thanh » nhanh thanh, thanh thanh, khanh thanh
hieu van » hieu va, thien van, lieu va
thanh cu » thanh chu, thanh tu, thanh ca
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cu tren » tu tren, dua tren
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
co hai » co dai, co hoi, o hai
o hoi » co hoi, o hoc, o hai

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 sach ky nang ((o hoi) OR (co hai)). ((hieu ve) OR (hieu van)) cac xuc van hanh thanh cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) or (co hai)). ((hieu ve) OR (hieu van)) cac xuc van hanh thanh cu tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (co hai)). ((hieu ve) OR (hieu van)) cac xuc van hanh thanh cu tren*.