Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, nhung don
van nguyen » toan nguyen, tran nguyen, xuan nguyen
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
hang cong » dang cong, hang nong, bang cong
trung va » truong va, trang va, trung ha

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