Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chiet tach » chieu sach
hieu cach » hieu cac, chieu sach, hieu ca
hanh manh » hanh mang, lanh manh, hoang manh
cong van » cong vang, cong san, song van
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 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 van van ban.
• Adding a wildcard symbol may retrieve word variants: toc ((hieu cach) or (chiet tach)) - hanh manh va nhung cong van van ban*.