Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
chu tinh » chau tinh, chua tinh, chu tich
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
san toan » van toan, dan toan, 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: theo ((chu tinh) OR (cuu tinh)) - hanh trinh va nhung cong san toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu tinh) OR (cuu tinh)) - hanh trinh va nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chu tinh) OR (cuu tinh)) - hanh trinh va nhung cong san toan cau*.