Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
lieu tinh » trieu tinh, diep tinh, bien tinh
hang cong » dang cong, hang nong, bang cong
trinh ve » trinh he, trinh va, trinh vi
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan
so lieu » so dieu
ve hang » ve hoang, ve chang, va hang

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 tinh - canh trinh ve hang cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - canh trinh ve hang cong ((tac toan) OR (tam toan)) cao.
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - canh trinh ve hang cong ((tac toan) or (tam toan)) cao*.