Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
hieu va » lieu va, hieu qua
nam dua » nam da, nam cua, nam mua
dua ban » dia ban, cua ban, qua ban
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sac ky)) nang ((xa hoi) or (ma hoa)). hieu va nam dua ban thanh van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) nang ((xa hoi) OR (ma hoa)). hieu va nam dua ban thanh van cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) nang ((xa hoi) or (ma hoa)). hieu va nam dua ban thanh van cuu tre*.