Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
thien van » thi van
ban thanh » ban hanh, ban hang
thai cau » thai cao, toan cau, thai van
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
o hai » co hai, so hai, _ hai
o lai » o lao
o hoi » co hoi, o hoc, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hoi) or (((o hai) or (o lai)))). thien van cac xuc ban thanh thai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (((o hai) OR (o lai)))). thien van cac xuc ban thanh thai cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (((o hai) or (o lai)))). thien van cac xuc ban thanh thai cau tren*.