Perhaps you should try some spelling variations:
trinh tinh » trinh kinh, trinh tin, trinh dinh
doi trinh » doc trinh, doi tinh, dong trinh
van khang » van khanh, van thanh, van quang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
hoa van » hoang van, hoa phan, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi trinh tinh - canh tranh ((van khang) or (((hoa dan) or (hoa van)))) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi trinh tinh - canh tranh ((van khang) OR (((hoa dan) OR (hoa van)))) cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: doi trinh tinh - canh tranh ((van khang) or (((hoa dan) or (hoa van)))) cong tac toan cao*.