Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
san chang » ban hang, dan chan, van khang
chang tu » chung tu, chang xu, hang tu
manh va » hanh va, anh va, minh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - canh ((manh va) or (hanh vi)) ((nhung cong) OR (dung cong)) san chang tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh ((manh va) OR (hanh vi)) ((nhung cong) OR (dung cong)) san chang tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh ((manh va) or (hanh vi)) ((nhung cong) OR (dung cong)) san chang tu".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh ((manh va) or (hanh vi)) ((nhung cong) OR (dung cong)) san chang tu*.