Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
chi sach » chinh sach, chieu sach, co sach
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - ((hanh trinh) OR (canh tranh)) chua ((hang cong) or (dang cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - ((hanh trinh) OR (canh tranh)) chua ((hang cong) OR (dang cong)) dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi sach - ((hanh trinh) OR (canh tranh)) chua ((hang cong) or (dang cong)) dan than cao".
• Adding a wildcard symbol may retrieve word variants: doi chi sach - ((hanh trinh) OR (canh tranh)) chua ((hang cong) or (dang cong)) dan than cao*.