Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
chi xanh » chi anh, chi danh, chi hanh
va phong » van phong, va phuong, va thong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
doi chi » doi khi
va hong » va thong, va huong, va khong

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

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