Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
trinh va » trinh van, trinh vat, trinh ve
dan phan » doan phan, dan chan, van phan

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

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