Perhaps you should try some spelling variations:
khanh thuan » khanh thuong, thanh tuan, khan than
van khanh » van thanh, van hanh, van anh
thuan cau » thuan cam, chuan chau, toan cau
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
so hai » son hai, su hai, so ha
ve cac » va cac, vien cac
o hoc » mo hoc, so hoc, y hoc

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 nang ((((o hoc) or (co hoc))) or (so hai)). hieu ve cac xuc van khanh thuan cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((o hoc) OR (co hoc))) OR (so hai)). hieu ve cac xuc van khanh thuan cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((o hoc) or (co hoc))) or (so hai)). hieu ve cac xuc van khanh thuan cau tren*.