Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh van » trinh han, trinh quan, trinh toan
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
trinh va » trinh vat, trinh ve, trinh vi
phan dau » phan tu, hang dau
so dieu » bo dieu, hoc dieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so lieu) or (so dieu)) tinh - canh ((trinh va) or (trinh van)) nhung cong doan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so lieu) OR (so dieu)) tinh - canh ((trinh va) OR (trinh van)) nhung cong doan phan dau.
• Adding a wildcard symbol may retrieve word variants: ((so lieu) or (so dieu)) tinh - canh ((trinh va) or (trinh van)) nhung cong doan phan dau*.