Perhaps you should try some spelling variations:
trong thanh » truong thanh, trung thanh, rong thanh
hanh trong » hanh trang, anh trong, hinh trong
thanh dang » thanh hang, thanh dan, thanh dong
hien xanh » hien hanh, hien nhanh, chieu xanh
dang cong » dung cong
sang toan » sang than, dang toan, quang toan
sang tao » hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (dieu hanh)) - hanh trong thanh dang cong ((sang toan) or (sang tao)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (dieu hanh)) - hanh trong thanh dang cong ((sang toan) OR (sang tao)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (dieu hanh)) - hanh trong thanh dang cong ((sang toan) or (sang tao)) tap*.