Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
canh manh » lanh manh, canh tranh, cach mang
he trung » le trung, he thong, do trung
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
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 ((he tong) or (he trung)) cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chiet tach)) - canh manh ((he tong) OR (he trung)) cong van toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chiet tach)) - canh manh ((he tong) or (he trung)) cong van toan ban*.