Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
chiet tach » chieu sach
hanh trung » thanh trung, hanh trang, manh trung
trung cap » truong cao, trung tam
dung tinh » dang tinh, dung ninh, dung tin
toan ban » van ban
cap ung » cap dung, cac ung, dap ung

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: hoc ((chieu xanh) OR (chiet tach)) - hanh trung cap ung dung tinh toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chiet tach)) - hanh trung cap ung dung tinh toan ban*.