Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trinh » canh tranh, hanh chinh
hien hanh » dieu hanh
trinh vat » trinh van, trinh luat, sinh vat
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
van tuan » van quan, van ban, anh tuan
tuan cao » toan cao, juan cao, quang cao

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) or (hieu nganh)) - hanh trinh vat ((hang cong) or (dang cong)) van tuan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (hieu nganh)) - hanh trinh vat ((hang cong) OR (dang cong)) van tuan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (hieu nganh)) - hanh trinh vat ((hang cong) or (dang cong)) van tuan cao*.