Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
van quang » van quan, tran quang, van tuan
tan thong » toan thong, tran thong, tao thong
thong cho » phong cho, thong co, trong cho
doc hieu » toc thieu, hoc thieu, hoc hien
van hang » van khang, van hoang, van thang
cong tan » cong tac, cong san, cong thanh

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 lang - thanh cong ((van hang) or (van quang)) cong tan thong cho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh cong ((van hang) OR (van quang)) cong tan thong cho*.