Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trinh » canh tranh, hanh trinh, canh tinh
nhung song » nhung cong, nhung bong, nhung huong
trinh va » trinh van, trinh vat, trinh ve
van phan » van phong, van thanh, luan phan

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 sach) or (chieu sang)) - canh trinh va ((nhung song) OR (nhung chong)) van phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - canh trinh va ((nhung song) OR (nhung chong)) van phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - canh trinh va ((nhung song) OR (nhung chong)) van phan tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - canh trinh va ((nhung song) OR (nhung chong)) van phan tu*.