Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
cua tren » dua tren, ca tren, cua tre
thai cua » than cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
o hoa » do hoa, so hoa, o ha
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: te ((sach ky) OR (sac ky)) nang ((o hoa) or (o hai)). hieu ve cac xuc van khanh thai cua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang ((o hoa) OR (o hai)). hieu ve cac xuc van khanh thai cua tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang ((o hoa) or (o hai)). hieu ve cac xuc van khanh thai cua tren".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang ((o hoa) or (o hai)). hieu ve cac xuc van khanh thai cua tren*.