Perhaps you should try some spelling variations:
thu sang » thu hang, thu san, thu bang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
sang ky » sang kyo, dang ky, tang ky
nam dua » nam da, nam cua, nam mua
dua ban » dia ban, cua ban, qua ban
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, me hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sang ky nang ((ma hoi) OR (ma hoa)). hieu van nam dua ban hanh vai cuu tre~.
• Adding a wildcard symbol may retrieve word variants: thu sang ky nang ((ma hoi) or (ma hoa)). hieu van nam dua ban hanh vai cuu tre*.