Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh toan » tinh toan, thanh toan, trinh han
luat cong » thuat cong, luat chung, cua cong
cong cong » cong dong, trong cong, dung cong
tich toan » tinh toan, tich than, hach toan
khi xanh » khia canh, thi hanh, thi anh
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi xanh - canh trinh luat cong cong ((((tich toan) OR (trinh toan))) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi xanh - canh trinh luat cong cong ((((tich toan) OR (trinh toan))) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi khi xanh - canh trinh luat cong cong ((((tich toan) OR (trinh toan))) or (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - canh trinh luat cong cong ((((tich toan) OR (trinh toan))) or (tap toan)) cau*.