Perhaps you should try some spelling variations:
cua truong » cua trung, xuan truong, cac truong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
nang sang » nang song, nong san
canh van » anh van, can van, cach van
cang san » cong san, cang sau, giang san
can ban » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - ((can ban) or (canh van)) cua truong ((cang san) OR (nang sang)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - ((can ban) OR (canh van)) cua truong ((cang san) OR (nang sang)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - ((can ban) or (canh van)) cua truong ((cang san) OR (nang sang)) van ban".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - ((can ban) or (canh van)) cua truong ((cang san) OR (nang sang)) van ban*.