Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
cac luoc » cac nuoc, cac cuoc, cac quoc
luoc van » luoc can, luoc va, luc van
hieu ve » hieu va, hieu van
thai cu » thai cua, thai xu, thi cu
cu tren » tu tren, dua tren
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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

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