Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
hien sach » dien sach, kien sach, thien hach
van toan » van tuan, van tan, van thanh
dan toan » dan than, manh toan, xuan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hanh trinh luan chung cong ((van toan) or (dan toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh trinh luan chung cong ((van toan) OR (dan toan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh trinh luan chung cong ((van toan) or (dan toan)) tap*.