Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
manh hung » anh huong
cong dan » cong san, cong tan, huong dan
toan ban » van ban
hung va » huong va, hung van, hang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu lang)) - manh hung va nhung cong dan ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - manh hung va nhung cong dan ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - manh hung va nhung cong dan ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - manh hung va nhung cong dan ((toan tap) OR (toan ban))*.