Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
cham duc » pham duc, pham duy, phan duc
hieu ve » hieu va, hieu van
ky tang » ky dang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
va cua » va chua, via cua, ca 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 tang) or (ky nang)) ha hoi. hieu ve ((cham duc) OR (cham soc)) ban thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky tang) OR (ky nang)) ha hoi. hieu ve ((cham duc) OR (cham soc)) ban thanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky tang) or (ky nang)) ha hoi. hieu ve ((cham duc) OR (cham soc)) ban thanh va cua tre*".