Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
van thanh » ban thanh, van tuan
van nhan » van phan, danh nhan, van khanh
lanh va » hanh va, anh va, lanh dao
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - lanh ((lanh va) or (tinh va)) nhung cong ((van nhan) OR (van thanh)) cach~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - lanh ((lanh va) OR (tinh va)) nhung cong ((van nhan) OR (van thanh)) cach.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - lanh ((lanh va) or (tinh va)) nhung cong ((van nhan) OR (van thanh)) cach".
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - lanh ((lanh va) or (tinh va)) nhung cong ((van nhan) OR (van thanh)) cach*.