Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan nhung » qua nhung, cua nhung, luan chung
cuong danh » cuon danh, huong dan, cuong linh
kien sach » dien sach, vien bach, kien mac
hoc kien » hoc hien, hoc vien, hoa kien
cong tan » cong tac, cong san, cong thanh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kien sach - hanh trinh quan nhung ((cong tan) OR (cuong danh)) ((toan ban) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kien sach - hanh trinh quan nhung ((cong tan) or (cuong danh)) ((toan ban) OR (van ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc kien sach - hanh trinh quan nhung ((cong tan) or (cuong danh)) ((toan ban) OR (van ban))*.