Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tranh van » tran van, trinh van, thanh van
chi hanh » chi nhanh, chi thanh, thi hanh
tranh va » trang va, trinh va, thanh va
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
chi dan » choi dan, chi van, thi dan

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