Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
tap doan » tap quan
doan cau » toan cau, doan dau, doan cap

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 sach - ((hanh trinh) or (canh tranh)) va ((nhung cong) OR (dung cong)) tap doan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - ((hanh trinh) OR (canh tranh)) va ((nhung cong) OR (dung cong)) tap doan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - ((hanh trinh) or (canh tranh)) va ((nhung cong) OR (dung cong)) tap doan cau".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - ((hanh trinh) or (canh tranh)) va ((nhung cong) OR (dung cong)) tap doan cau*.