Perhaps you should try some spelling variations:
luan phung » luan phuong, luan chung, luan phong
bien tinh » bi tinh, yen tinh, diep tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
than tap » toan tap, han tap, phan tap
ho bien » pho bien, hoa bien, so bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho bien tinh - hanh tang luan phung ((cong dan) or (cong tac)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho bien tinh - hanh tang luan phung ((cong dan) OR (cong tac)) than tap.
• Adding a wildcard symbol may retrieve word variants: ho bien tinh - hanh tang luan phung ((cong dan) or (cong tac)) than tap*.