Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien khanh » hien nhanh, dien khanh, thien thanh
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien nhanh, chieu xanh, khien canh
hien hanh » dieu hanh
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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) OR (hien khanh))) or (hien hanh)) - hanh tranh va nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hien xanh) OR (hien khanh))) OR (hien hanh)) - hanh tranh va nhung cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hien xanh) OR (hien khanh))) or (hien hanh)) - hanh tranh va nhung cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien xanh) OR (hien khanh))) or (hien hanh)) - hanh tranh va nhung cong dan van ban*.