Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
canh manh » lanh manh, cach mang, van manh
tong cong » trong cong, cong cong, dung cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
he tong » he thong, he trong, he cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (chiet tach)) - ((canh manh) OR (canh tranh)) he tong cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chiet tach)) - ((canh manh) OR (canh tranh)) he tong cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chiet tach)) - ((canh manh) OR (canh tranh)) he tong cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chiet tach)) - ((canh manh) OR (canh tranh)) he tong cong dan toan ban*.