Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
tinh cua » trinh cua, sinh cua, tinh chat
cong van » cong vang, cong san, song van
tuan tap » tuan tai, tuyen tap, toan tai
toan tap » toan ban
luat » luan, xuat

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 - hanh ((trinh luat) or (tinh cua)) nhung cong van ((tuan tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((trinh luat) OR (tinh cua)) nhung cong van ((tuan tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((trinh luat) or (tinh cua)) nhung cong van ((tuan tap) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trinh luat) or (tinh cua)) nhung cong van ((tuan tap) OR (toan tap))*.