Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, minh trang
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, dieu hanh, hien hanh
va thong » va thuong, va phuong, he thong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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

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