Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh van » trinh han, trinh quan, trinh toan
cong toan » cong tan, cong hoan, cong tuan
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) or (trinh van)) nhung cong toan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi hanh - canh ((tranh va) OR (trinh van)) nhung cong toan phan dau.
• Adding a wildcard symbol may retrieve word variants: doi chi hanh - canh ((tranh va) or (trinh van)) nhung cong toan phan dau*.