Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, cac khoi, dai khoa
tai khoa » da khoa, noi khoa
tai cua » thai cua, tai cuc, tri cua
xuc vay » xuc hay
cau xuc » cam xuc, cau luc, cau truc
dai moi » doi moi, dai hoi
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang

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 y sang ((((mai khoi) or (tai khoa))) or (dai moi)). hieu van cau xuc vay doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y sang ((((mai khoi) OR (tai khoa))) OR (dai moi)). hieu van cau xuc vay doanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y sang ((((mai khoi) or (tai khoa))) or (dai moi)). hieu van cau xuc vay doanh tai cua tre*.