Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
hoi hieu » hoi phieu, hoi tieu, moi hieu
va trong » va truong, va thong, va tuong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
ho hieu » ho chieu, nho hieu, co hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) OR (hoi hieu)) lang - ((canh tranh) or (hanh trinh)) va trong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - ((canh tranh) OR (hanh trinh)) va trong cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) OR (hoi hieu)) lang - ((canh tranh) or (hanh trinh)) va trong cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) OR (hoi hieu)) lang - ((canh tranh) or (hanh trinh)) va trong cong dan toan cao*.