Perhaps you should try some spelling variations:
trung cong » truong cong, trung uong, trang cong
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cua » trinh cua, sinh cua, tinh chat
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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