Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doc hieu » hoc thieu, hoc hien
minh cua » manh cua, sinh cua, dinh cua
tinh cua » trinh cua, sinh cua, tinh chat
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) OR (toc thieu)) xanh - hoang ((minh cua) or (tinh cua)) nhung cong van than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) xanh - hoang ((minh cua) OR (tinh cua)) nhung cong van than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) xanh - hoang ((minh cua) or (tinh cua)) nhung cong van than tap".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) xanh - hoang ((minh cua) or (tinh cua)) nhung cong van than tap*.