Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
hanh trinh » canh tranh, hanh chinh
thiet hung » thuyet hung, viet hung, hiep hung
hung cong » nhung cong, hung cuong, phung cong
khi sinh » ki sinh, thi sinh, khoe sinh
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: doi khi sinh - hanh trinh thiet hung cong san toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi khi sinh - hanh trinh thiet hung cong san toan cau*.