Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
dong thanh » truong thanh
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tinh » nhanh tinh, thanh tinh, canh tinh
cua trung » cua truong, xuan trung, cua nhung
cong san » cong tac
toan tap » toan ban

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