Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang vay » dang van, dang xay, dang vat
thanh di » thanh doi, thanh de, thanh do
toc sach » hoc sach, doc sach, thuoc sach
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
dang va » dang van, dang vat, hang va
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
di cuu » di cau, di cua, dinh cuu

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) or (toc sach)) ky ((dang va) or (dang vay)) hoi. hieu ve cam duc ban thanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((dang va) OR (dang vay)) hoi. hieu ve cam duc ban thanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky ((dang va) or (dang vay)) hoi. hieu ve cam duc ban thanh di cuu tre*.