Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
nhan thong » nhan trong, nha thong, nhan khong
nghe thong » he thong
duong dan » duong dang, huong dan, duong van
chi sang » chi lang, chieu sang, chi chang
dan toan » van toan, dan than, manh toan
toan ban » van ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - canh thanh ((nhan thong) or (nghe thong)) duong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - canh thanh ((nhan thong) OR (nghe thong)) duong dan toan ban*.