Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, tien thanh
hanh trinh » canh tranh, hanh chinh
trinh nghe » trinh nghien, trinh he, trinh nha
hien hanh » dieu hanh
nghe dung » nghe ung, nghe vung, nghiep dung
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien chanh) or (hien hanh)) - hanh trinh nghe dung trong ((van toan) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien chanh) OR (hien hanh)) - hanh trinh nghe dung trong ((van toan) OR (van tan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien chanh) or (hien hanh)) - hanh trinh nghe dung trong ((van toan) or (van tan)) cao*.