Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
cong trong » cong thuong, duong trong, cong trinh
trong che » trong cho, trong he, trong chien
che nang » cho nang, chuc nang, chua nang
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
tuan cau » toan cau, quan cau, tuan cu

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 sach) OR (chiet tach)) - cong trong che nang ((cong van) or (song van)) tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - cong trong che nang ((cong van) OR (song van)) tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chiet tach)) - cong trong che nang ((cong van) or (song van)) tuan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chiet tach)) - cong trong che nang ((cong van) or (song van)) tuan cau*.