Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
chiet tach » chieu sach
khong cong » thong cong, khong cang, khong con
chong cong » cong cong, thong cong, cuong cong
trung cua » truong cua, trung tuan, trung cap
san toan » van toan, dan toan, manh toan
toan ban » van 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 ((chieu xanh) or (chiet tach)) - thanh trung cua ((khong cong) OR (chong cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chiet tach)) - thanh trung cua ((khong cong) OR (chong cong)) san toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chiet tach)) - thanh trung cua ((khong cong) OR (chong cong)) san toan ban*".