Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
cham tinh » chau tinh, cham binh, ha tinh
tranh cua » doanh cua
chi tinh » chai tinh, chi minh, chi binh
manh cua » doanh cua, ban cua
cong san » cong tac
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi tinh) or (cham tinh)) - canh ((tranh cua) OR (manh cua)) nhung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi tinh) OR (cham tinh)) - canh ((tranh cua) OR (manh cua)) nhung cong san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi tinh) or (cham tinh)) - canh ((tranh cua) OR (manh cua)) nhung cong san van ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chi tinh) or (cham tinh)) - canh ((tranh cua) OR (manh cua)) nhung cong san van ban*.