Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
ty bang » te bang, ty hang, tao bang
cau hoa » cau hoi
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty bang) OR (ty xang)) cau hoa. hieu va cao xuc va hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty bang) OR (ty xang)) cau hoa. hieu va cao xuc va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty bang) OR (ty xang)) cau hoa. hieu va cao xuc va hanh tai cua tre*.