Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
toan hung » toan chung, toan khung, tran hung
hung cong » nhung cong, hung cuong, phung cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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: ho ((hieu lang) or (chieu sach)) - ((hanh trinh) OR (canh tranh)) toan hung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - ((hanh trinh) OR (canh tranh)) toan hung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chieu sach)) - ((hanh trinh) OR (canh tranh)) toan hung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - ((hanh trinh) OR (canh tranh)) toan hung cong dan toan cau*.