Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien sach » dien sach, kien sach, thien hach
cam nhung » nam nhung, tham nhung, cam nang
cam hung » cac chung, cam nang, van hung
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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 - ((thanh trung) or (thanh tung)) ((cam nhung) OR (cam hung)) cong dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - ((thanh trung) OR (thanh tung)) ((cam nhung) OR (cam hung)) cong dan khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - ((thanh trung) or (thanh tung)) ((cam nhung) OR (cam hung)) cong dan khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - ((thanh trung) or (thanh tung)) ((cam nhung) OR (cam hung)) cong dan khan cap*.