Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
nhan luc » nang luc
thanh de » hanh de, thanh ve, thanh do
hieu van » hieu va, thien van, hieu ve
hau luc » hau loc, cau luc, hieu luc
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu 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 ky nang ma hoi. ((hieu van) or (lieu va)) ((hau luc) or (nhan luc)) van thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoi. ((hieu van) OR (lieu va)) ((hau luc) OR (nhan luc)) van thanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ma hoi. ((hieu van) or (lieu va)) ((hau luc) or (nhan luc)) van thanh de cua tre*.