Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thai cuu » thai cua, tai cuc, thi cuc
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren, cau treo
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va
ly hang » ly quang
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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

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