Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
vien cac » vien bach, vien dai, vien da
tang van » dang van, hoang van, trong van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((tang ma) or (tang van)) hoi. hieu ((ve cam) or (vien cac)) duc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((tang ma) OR (tang van)) hoi. hieu ((ve cam) OR (vien cac)) duc ban thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((tang ma) or (tang van)) hoi. hieu ((ve cam) or (vien cac)) duc ban thanh tai cua tre*.