Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh cua » tinh cua, trinh luat, trinh quan
cua trong » cua truong, cua trung, qua trong
chinh cau » chinh chau, chinh ca, chinh can
cong tan » cong tac, cong san, cong thanh
chan cau » phan cau, can cau, nhanh cau

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 xanh - hanh trinh cua trong cong tan ((chan cau) OR (chinh cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh trinh cua trong cong tan ((chan cau) OR (chinh cau))*".