Perhaps you should try some spelling variations:
khanh thi » nhanh thi, khanh thu, nhanh thai
van khanh » van thanh, van hanh, van anh
cu tren » tu tren, dua tren
cac xuc » cac nuoc, chat xuc, cac cuoc
hieu ve » hieu va, hieu van
thi cu » thi cuc
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 (cam xuc)) van khanh thi 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 (cam xuc)) van khanh thi 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 (cam xuc)) van khanh thi cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((co hoi) or (o hai)). hieu ve ((cac xuc) OR (cam xuc)) van khanh thi cu tren*.