Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
chua dang » cua dang, chua dong, chua xang
chua nang » chuc nang, chua xang, kha nang
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

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