Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
cua trong » cua truong, cua trung, qua trong
khao cuu » cham cuu, chao chu, kho cua
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "khao cuu van - hanh trinh cua trong ((cong dan) OR (cong tan)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: khao cuu van - hanh trinh cua trong ((cong dan) OR (cong tan)) toan tap*.