Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
sach thu » sach thue, sach thieu, sach tham
dao van » do van, dang van
van bac » van bao, van hac, dan bac
sach ty » sach y, sach tu, xach tay
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach thu)) nang x hoi. thien ((van bac) OR (van ban)) dao van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) nang x hoi. thien ((van bac) OR (van ban)) dao van thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) nang x hoi. thien ((van bac) OR (van ban)) dao van thanh vi cua tre*".