Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
san khoan » san khoa, toan khoan, cac khoan
khoan cam » khoa cam, khoan va, phan cam
cong san » cong tac
va bang » va nang, va lang, va 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 (chieu tinh)) - thanh trung ((va bang) or (cam nang)) cong san khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu tinh)) - thanh trung ((va bang) OR (cam nang)) cong san khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu tinh)) - thanh trung ((va bang) or (cam nang)) cong san khoan cam".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu tinh)) - thanh trung ((va bang) or (cam nang)) cong san khoan cam*.