Perhaps you should try some spelling variations:
doanh nhung » doanh chung, doanh thuong, doanh nhan
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
theo chu » theo chieu, cho chu, chao chu
chu tach » chu tich, chu thich, chu thanh
cong dan » cong san, cong tan, huong dan
than cao » thai cao, than cap, than sao
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: theo chu tach - ((hanh trinh) OR (canh tranh)) doanh nhung cong dan ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu tach - ((hanh trinh) OR (canh tranh)) doanh nhung cong dan ((than cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu tach - ((hanh trinh) OR (canh tranh)) doanh nhung cong dan ((than cao) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo chu tach - ((hanh trinh) OR (canh tranh)) doanh nhung cong dan ((than cao) or (toan cao))*.