Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
sach thu » sach thue, sach thieu, sach tham
cham duc » pham duc, cham soc, pham duy
cuu tre » cua tre, cau tren, cau treo
van cuu » van cau, van chu, van cu
duc ban » duc tan, duc van, dua ban
va cham » va chat, va tham
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach thu)) tang ((xa hoi) or (mai hoi)). hieu va cham duc ban thanh van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach thu)) tang ((xa hoi) OR (mai hoi)). hieu va cham duc ban thanh van cuu tre.
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach thu)) tang ((xa hoi) or (mai hoi)). hieu va cham duc ban thanh van cuu tre*.