Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
hieu cach » hieu cac, chieu sach, hieu ca
hanh manh » hanh mang, lanh manh, hoang manh
manh va » hanh va, anh va, minh va
van van » tan van, san van, van vat

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

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