Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh van, trinh luat, sinh vat
cua tinh » cua sinh, va tinh, ha tinh
trinh va » trinh van, trinh ve, trinh vi
cong san » cong tac
toan cao » toan tap
toan ban » van ban
hoa cua » hoa chat, hoa xuat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoa cua tinh - hanh ((trinh va) or (trinh vat)) nhung cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoa cua tinh - hanh ((trinh va) OR (trinh vat)) nhung cong san ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoa cua tinh - hanh ((trinh va) or (trinh vat)) nhung cong san ((toan cao) or (toan ban))*.