Perhaps you should try some spelling variations:
thien hach » thien thanh
thanh tung » thanh cong
hien hanh » dieu hanh
dung cong » dung trong
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (hien hanh)) - thanh tung cua dung cong ((dan than) or (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (hien hanh)) - thanh tung cua dung cong ((dan than) OR (van than)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (hien hanh)) - thanh tung cua dung cong ((dan than) or (van than)) cau*.