Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sang » chieu sach, chieu xanh, hieu lang
thien anh » thien danh, tien anh, thien thanh
tranh cua » doanh cua, manh cua
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (thien anh)) - hanh tranh cua tong ((cong dan) OR (cong tan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thien anh)) - hanh tranh cua tong ((cong dan) OR (cong tan)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (thien anh)) - hanh tranh cua tong ((cong dan) OR (cong tan)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thien anh)) - hanh tranh cua tong ((cong dan) OR (cong tan)) van ban*.