Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
hien tach » thien hach, chiet tach, vien bach
thanh bai » thanh hai, thanh tai, thanh oai
bang cong » dang cong, bang song, hang cong
bai bang » hai bang, ba bang, bai tang
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien tach - canh thanh bai bang cong dan ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - canh thanh bai bang cong dan ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - canh thanh bai bang cong dan ((than cau) or (toan cau))*.