Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chi sang » chi lang, chieu sang, chi chang
trinh va » trinh van, trinh vat, trinh ve
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
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 sang - canh ((trinh va) or (trang va)) nhung cong tan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - canh ((trinh va) OR (trang va)) nhung cong tan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi chi sang - canh ((trinh va) or (trang va)) nhung cong tan ((toan cau) or (toan ban))*.