Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dung tay » dung tai, dung may, vung tay
vanh dai » van dai, vanh tai, lanh dao
ban vanh » ban hanh, ban van, ban anh
cam duc » cam xuc, cao duc, nam duoc
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
dan tay » ban tay, dao tay, gian tay

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 y ((dung tay) or (dan tay)) hoi. hieu ve ((cam duc) OR (pham duc)) ban vanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((dung tay) OR (dan tay)) hoi. hieu ve ((cam duc) OR (pham duc)) ban vanh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((dung tay) or (dan tay)) hoi. hieu ve ((cam duc) OR (pham duc)) ban vanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((dung tay) or (dan tay)) hoi. hieu ve ((cam duc) OR (pham duc)) ban vanh dai cuu tre*.