Perhaps you should try some spelling variations:
thong xuong » khong xuong, thong duong, thong huong
hanh trinh » canh tranh, hanh chinh
hien hanh » dieu hanh
trinh tai » trinh toan, trinh tu, trinh han
tai thong » tai thuong, tai phong, tai trong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 tai thong xuong ((xuan toan) or (((dan than) OR (van than)))) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - hanh trinh tai thong xuong ((xuan toan) OR (((dan than) OR (van than)))) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - hanh trinh tai thong xuong ((xuan toan) or (((dan than) OR (van than)))) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh trinh tai thong xuong ((xuan toan) or (((dan than) OR (van than)))) cao*.