Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
quan trong » gian trong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh tang) OR (hanh trinh)) quan trong cong san ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh tang) or (hanh trinh)) quan trong cong san ((toan cau) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh tang) or (hanh trinh)) quan trong cong san ((toan cau) OR (toan tap))*.