Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
canh tran » canh tranh, hanh trang, banh trang
tran van » luan van
van hung » van dung, manh hung, van duong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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 tran van hung ((cong dan) OR (cong san)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - canh tran van hung ((cong dan) OR (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tran van hung ((cong dan) OR (cong san)) toan tap*.