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

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 dan cong ((sang toan) or (sang than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (dieu hanh)) - hanh trong thanh dan cong ((sang toan) OR (sang than)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (dieu hanh)) - hanh trong thanh dan cong ((sang toan) or (sang than)) tap*.