Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
cau treo » cau theo, cau tren, cau triet
thai cau » thai cao, toan cau, thai van
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai
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 y nang ((o hoi) or (o hai)). hieu ve cac ((xuc van) OR (luc van)) khanh thai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoi) OR (o hai)). hieu ve cac ((xuc van) OR (luc van)) khanh thai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((o hoi) or (o hai)). hieu ve cac ((xuc van) OR (luc van)) khanh thai cau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoi) or (o hai)). hieu ve cac ((xuc van) OR (luc van)) khanh thai cau treo*.