Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
so lieu » so dieu
co lieu » cot lieu, co hieu, cu lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so lieu) or (co lieu)) tinh - canh trinh va nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so lieu) OR (co lieu)) tinh - canh trinh va nhung cong san toan cao*.