Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hai thuong » hoai thuong, khai thuong, han thuong
canh tran » canh tranh, hanh trang, banh trang
chi lang » thi lan, chi van, hoi lang
tran hai » tran bai, tran chau, tran nhat
tan toan » tan tran, tap toan, van toan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chi lang - canh tran hai thuong cong ((tan toan) or (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chi lang - canh tran hai thuong cong ((tan toan) OR (bai toan)) ban*.