Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
hua khong » hoa khong, cua khong, hoac khong
anh tang » anh bang, anh dang, anh nang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: doi chieu sang - ((anh tang) or (hanh trinh)) hua khong ((cong dan) OR (cong san)) than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((anh tang) OR (hanh trinh)) hua khong ((cong dan) OR (cong san)) than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((anh tang) or (hanh trinh)) hua khong ((cong dan) OR (cong san)) than ban".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((anh tang) or (hanh trinh)) hua khong ((cong dan) OR (cong san)) than ban*.