Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
luat cong » thuat cong, luat chung, cua cong
cong cong » cong dong, trong cong, dung cong
thi hanh » thi thanh
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan
doi thi » doi thoi, do thi, 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 thi hanh - canh trinh luat cong cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi thi hanh - canh trinh luat cong cong ((tac toan) OR (tam toan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi thi hanh - canh trinh luat cong cong ((tac toan) or (tam toan)) cao*.