Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
hieu sang » chieu sang, hieu lang, hieu quang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
van thang » van thanh, van khang, van hang
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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 sang - hanh trung cua nhung cong ((((dan than) OR (van thang))) OR (ban than)) cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh trung cua nhung cong ((((dan than) or (van thang))) or (ban than)) cau*.