Perhaps you should try some spelling variations:
hanh trinh » canh tranh
nhung cong » dung cong, thong cong, hang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
hoc may » hoc ma
ho may » hoa may, cho may, hop may

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

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