Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien hanh » dieu hanh
hinh sinh » tinh sinh, hinh dinh, hinh kinh
dung cong » dung trong
qua dung » quang dung, su dung, qua song
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: hoc hien hanh - ((hanh trinh) or (hinh sinh)) qua dung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - ((hanh trinh) OR (hinh sinh)) qua dung cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - ((hanh trinh) or (hinh sinh)) qua dung cong san toan cau*.