Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tang luan » dung luan
dung cong » dung trong
hang cua » mang cua, hang ca, huong cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 - hanh ((hang cua) or (tang luan)) dung cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((hang cua) OR (tang luan)) dung cong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((hang cua) or (tang luan)) dung cong dan toan tap*.