Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
dinh cua » dinh cuu, sinh cua, dinh cu
tinh cua » trinh cua, sinh cua, tinh chat
van tuan » van quan, van ban, anh tuan
tuan tap » toan tap, tuan tai, tuyen 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 xanh - hoang ((dinh cua) or (tinh cua)) ((nhung cong) or (dung cong)) van tuan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hoang ((dinh cua) OR (tinh cua)) ((nhung cong) OR (dung cong)) van tuan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hoang ((dinh cua) or (tinh cua)) ((nhung cong) or (dung cong)) van tuan tap*.