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 nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
dang cong » dung cong
sang toan » dang toan, quang toan, sang tao
sang than » cang thang, dang thanh, sang tao

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 (hien hanh)) - hanh trong thanh dang cong ((sang toan) OR (sang than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - hanh trong thanh dang cong ((sang toan) OR (sang than)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - hanh trong thanh dang cong ((sang toan) OR (sang than)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - hanh trong thanh dang cong ((sang toan) OR (sang than)) tap*.