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, ca tren
thai cau » thai cao, toan cau, thai van
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
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 ((sach ky) OR (sac ky)) nang ((o hoi) or (o hai)). hieu va cac xuc van khanh thai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ((o hoi) OR (o hai)). hieu va cac xuc van khanh thai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang ((o hoi) or (o hai)). hieu va cac xuc van khanh thai cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang ((o hoi) or (o hai)). hieu va cac xuc van khanh thai cau tren*.