Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hien tinh » khien tinh, thien tinh, bien tinh
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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

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