Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
luu hanh » huu han
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
x hoi » o hoi, x ho, 5 hoi

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 xang ((x hoi) or (xa hoi)). hieu va cam ((duc van) or (luu hanh)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty xang ((x hoi) OR (xa hoi)). hieu va cam ((duc van) OR (luu hanh)) thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty xang ((x hoi) or (xa hoi)). hieu va cam ((duc van) or (luu hanh)) thanh tai cua tre*.