Perhaps you should try some spelling variations:
khan thuong » khanh thuong, phan thuong, han thuong
thuong dong » phuong dong, tuong dong, chuong dong
cong khan » cong khanh, cong nhan, cong phan
dong dan » dong danh, duong dan, dong san
toan cao » toan ban, toan tap
di tinh » doi tinh, vi tinh, bi tinh
so di » so dia, so du, so dk

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

• Performing a fuzzy search may retrieve terms with similar spellings: so di tinh - thanh cong khan thuong dong dan ((van ban) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so di tinh - thanh cong khan thuong dong dan ((van ban) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: so di tinh - thanh cong khan thuong dong dan ((van ban) or (toan cao))*.