Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh
hien xanh » hien hanh, hien nhanh, chieu xanh
tong cong » trong cong, cong cong, dung cong
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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 xanh) OR (chieu sach)) - ((hanh trinh) OR (hanh chinh)) cua tong cong dan than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu sach)) - ((hanh trinh) OR (hanh chinh)) cua tong cong dan than ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sach)) - ((hanh trinh) OR (hanh chinh)) cua tong cong dan than ban*.