Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
hien xanh » hien hanh, hien nhanh, chieu xanh
luan hang » luan nang, luan han, luan hung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban
toan tap » toan 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 hien xanh - canh tranh luan hang ((cong dan) or (cong san)) ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh luan hang ((cong dan) OR (cong san)) ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh luan hang ((cong dan) or (cong san)) ((toan cao) or (toan tap))*.