Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trang » thanh trung, canh tranh, hanh trinh
cua phuong » cuc phuong, luan phuong, xuan phuong
cuu phuong » cac phuong, thu phuong
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.

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