Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
chinh cua » chinh ca, chinh sua, hinh cua
ban cong » bang cong, van cong, phan cong
cong san » cong tac
khan cap » than cap, khoan cam, phan cac
khoa cam » khoan cam, khoa kham, khoa ma
khan ap » han ap, khan dam

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 chinh cua ban cong san ((((khan cap) OR (khan ap))) or (khoa cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh chinh cua ban cong san ((((khan cap) OR (khan ap))) OR (khoa cam))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh chinh cua ban cong san ((((khan cap) OR (khan ap))) or (khoa cam))*".