Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doc hieu » hoc thieu, hoc hien
hanh han » hanh nhan, hanh phan, hanh san
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
han va » hang va, hanh va, nhan va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) quang - hanh han va nhung cong dan ((toan tai) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) quang - hanh han va nhung cong dan ((toan tai) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) quang - hanh han va nhung cong dan ((toan tai) or (toan ban))*.