Perhaps you should try some spelling variations:
tran nguyen » toan nguyen, thai nguyen, trieu nguyen
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
van nguyen » toan nguyen, xuan nguyen, tuan nguyen
hien hanh » dieu hanh
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 ((chieu xanh) or (hien hanh)) - thanh trung va nhung cong ((van nguyen) OR (tran nguyen)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (hien hanh)) - thanh trung va nhung cong ((van nguyen) OR (tran nguyen)) van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (hien hanh)) - thanh trung va nhung cong ((van nguyen) OR (tran nguyen)) van".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (hien hanh)) - thanh trung va nhung cong ((van nguyen) OR (tran nguyen)) van*.