Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
toan phan » thanh phan, toan ban, hoa phan
chi hanh » chi nhanh, chi thanh, thi hanh
tranh va » tranh van, trang va, trinh va
phan dau » phan tu, hang dau
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 - canh tranh va ((nhung cong) OR (dung cong)) toan phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi hanh - canh tranh va ((nhung cong) OR (dung cong)) toan phan dau".
• Adding a wildcard symbol may retrieve word variants: doi chi hanh - canh tranh va ((nhung cong) OR (dung cong)) toan phan dau*.