Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
nhanh vi » hanh vi, nhanh va, nhanh thi
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ve cao » va cao, ve cac, ve co
ha hoi » hoa hoi, ha noi, xa hoi
ve bao » te bao, va bao

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 ky lang ha hoi. hieu ((ve cao) or (ve bao)) duc van ((nhanh vi) or (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang ha hoi. hieu ((ve cao) OR (ve bao)) duc van ((nhanh vi) OR (thanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang ha hoi. hieu ((ve cao) or (ve bao)) duc van ((nhanh vi) or (thanh va)) cua tre*.