Perhaps you should try some spelling variations:
khanh than » khanh thanh, khanh thuan, khan than
van khanh » van thanh, van hanh, van anh
than cua » nhan cua, thai cua, ban cua
sach ky » sac ky, sach y, sach kem
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
co hoi » co hoc, co loi
ve cac » va cac, vien cac
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 (sach ty)) nang ((co hoi) or (o hai)). hieu ve cac xuc van khanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang ((co hoi) OR (o hai)). hieu ve cac xuc van khanh than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang ((co hoi) or (o hai)). hieu ve cac xuc van khanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang ((co hoi) or (o hai)). hieu ve cac xuc van khanh than cua tre*.