Perhaps you should try some spelling variations:
khanh toan » thanh toan, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
toan cau » toan cao, toan ban, toan tap
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
y nang » ky nang, ly nang, v nang
co hai » co dai, co hoi, o hai
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((o hoc) or (co hai)). hieu ve cac xuc van khanh toan cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((o hoc) OR (co hai)). hieu ve cac xuc van khanh toan cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((o hoc) or (co hai)). hieu ve cac xuc van khanh toan cau tren*.