Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
thien anh » thien danh, tien anh, thien thanh
trinh ve » trinh he, trinh va, trinh vi
ve nhung » va nhung, tu nhung
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 ((dieu hanh) or (thien anh)) - hanh trinh ve nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (thien anh)) - hanh trinh ve nhung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (thien anh)) - hanh trinh ve nhung cong san toan cao*.