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
duc manh » suc manh, duc anh, duc minh
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
dan tay » ban tay, dao tay, gian tay
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ban) or (duc manh)) vanh dai cua 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 ban) OR (duc manh)) vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((dung tay) or (dan tay)) hoi. hieu ve cam ((duc ban) or (duc manh)) vanh dai cua tre*.