Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cong gian » chong gian, con gian, cong giao
toc hieu » toc thieu, doc hieu, hoc thieu
gian dan » gian lang
dan cong » dang cong, van cong, dan dong
cong dan » cong san, cong tan, huong dan
phan van » pham van, thanh van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu lang - thanh cong gian dan cong dan ((phan van) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu lang - thanh cong gian dan cong dan ((phan van) OR (phan tu))*".