Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc 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
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
dan tay » ban tay, dao tay, gian tay
va cao » va cac, va co, va dao
ve cao » ve bao, ve cac, ve co

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y ((dung tay) or (dan tay)) hoi. hieu ((ve cao) or (va cao)) duc ban vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y ((dung tay) OR (dan tay)) hoi. hieu ((ve cao) OR (va cao)) duc ban vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach y ((dung tay) or (dan tay)) hoi. hieu ((ve cao) or (va cao)) duc ban vanh dai cua tre*.