Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
thai cuu » thai cua, tai cuc, thi cuc
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ly hang » ly quang
ve cac » va cac, vien cac
co hai » co dai, co hoi, o hai
o hoi » co hoi, o hoc, o hai

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) OR (thu sach)) ly hang ((o hoi) or (co hai)). hieu ve cac xuc van khanh thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly hang ((o hoi) OR (co hai)). hieu ve cac xuc van khanh thai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ly hang ((o hoi) or (co hai)). hieu ve cac xuc van khanh thai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ly hang ((o hoi) or (co hai)). hieu ve cac xuc van khanh thai cuu tre*.