Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cu tren » tu tren, dua tren
cac xuc » cam xuc, chat xuc, cac cuoc
thai cu » thai cua, thai xu, thi cu
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
co hoi » co hoc, co loi
sac ky » cac ky, sai ky
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 sac ky nang ((co hoi) or (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((co hoi) OR (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thai cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((co hoi) or (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thai cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((co hoi) or (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thai cu tren*.