Perhaps you should try some spelling variations:
trong van » trong cac
khi tinh » khoi tinh, kho tinh, thi tinh
khi sinh » ki sinh, thi sinh, khoe sinh
vat dung » van dung, viet dung, mat duong
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
va dung » van dung, va duong, va ung

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 tinh) or (khi sinh)) - canh tranh ((va dung) or (vat dung)) trong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((khi tinh) OR (khi sinh)) - canh tranh ((va dung) OR (vat dung)) trong van toan cao.
• Adding a wildcard symbol may retrieve word variants: doi ((khi tinh) or (khi sinh)) - canh tranh ((va dung) or (vat dung)) trong van toan cao*.