Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trang » thanh trung, hanh trinh, minh trang
cua nhung » va nhung
chi hanh » chi nhanh, chi thanh, thi hanh
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan
doi chi » doi khi

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 hanh - ((hanh trang) or (canh tranh)) cua nhung cong ((tac toan) OR (tam toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi hanh - ((hanh trang) OR (canh tranh)) cua nhung cong ((tac toan) OR (tam toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi hanh - ((hanh trang) or (canh tranh)) cua nhung cong ((tac toan) OR (tam toan)) tap".
• Adding a wildcard symbol may retrieve word variants: doi chi hanh - ((hanh trang) or (canh tranh)) cua nhung cong ((tac toan) OR (tam toan)) tap*.