Perhaps you should try some spelling variations:
cong khanh » cong thanh, cong khan, cong nhan
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
cong hach » cong sach, cong thanh, trong hach
tang cua » mang cua, hang cua, tang luan
cua tong » cua cong, cua dong, cua nong
toan ban » van ban

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 hanh - hanh tang cua tong ((cong hach) OR (cong khanh)) toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - hanh tang cua tong ((cong hach) OR (cong khanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh tang cua tong ((cong hach) OR (cong khanh)) toan ban*.