Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
cau tren » cu tren, dau tren, cau treo
ca tren » cu tren, la tren, co tren
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
vuc van » duc van, luc van, thuc van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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 sac ky nang ((o hoi) or (o hai)). hieu ve cac vuc van khanh thai ((cau tren) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((o hoi) OR (o hai)). hieu ve cac vuc van khanh thai ((cau tren) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((o hoi) or (o hai)). hieu ve cac vuc van khanh thai ((cau tren) or (ca tren))*.