Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » doc sach, thuoc sach, nuoc sach
thanh le » thinh le, thanh ve, thanh de
hoc sach » hoc sinh, hoc cac, hoc anh
van nang » van quang, van ban, van dong
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cac xuc » cam xuc, chat xuc, cac cuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
le cua » ly cua

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) or (hoc sach)) van nang ma hoi. hieu ve ((cac xuc) or (cac nuoc)) van thanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) van nang ma hoi. hieu ve ((cac xuc) OR (cac nuoc)) van thanh le cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) van nang ma hoi. hieu ve ((cac xuc) or (cac nuoc)) van thanh le cua tre*.