Perhaps you should try some spelling variations:
khanh thang » nhanh thang, thanh thang, khanh thanh
thang cao » thong cao, thang lao, nang cao
van khanh » van thanh, van hanh, van anh
cao tren » ca tren, cau tren, co tren
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach ty
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 ((sach ky) or (sach tu)) nang ((o hoi) or (o hai)). hieu ve cac xuc van khanh thang cao tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach tu)) nang ((o hoi) OR (o hai)). hieu ve cac xuc van khanh thang cao tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach tu)) nang ((o hoi) or (o hai)). hieu ve cac xuc van khanh thang cao tren*.