Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trung » thanh trung, hanh trang, manh trung
dung cong » dung trong
trung ap » trung cap, trung lap, trung tam
tan than » tan thanh, tan tran, tam than
ban than » ban thanh, van thanh, ban hang
ap dung » xay dung, van dung

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (dieu hanh)) - hanh trung ap dung cong ((tan than) OR (ban than)) cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu xanh) or (dieu hanh)) - hanh trung ap dung cong ((tan than) OR (ban than)) cap~".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) or (dieu hanh)) - hanh trung ap dung cong ((tan than) OR (ban than)) cap*.