Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh dung » thanh duong, thanh tung, thanh hung
nhung cong » dung cong, thong cong, hang cong
hanh dung » anh dung, hanh dong, manh dung
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
toan ban » van ban
toan cao » toan tap

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: ho chieu sang - ((hanh dung) OR (thanh dung)) va nhung cong dan ((toan ban) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - ((hanh dung) OR (thanh dung)) va nhung cong dan ((toan ban) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((hanh dung) OR (thanh dung)) va nhung cong dan ((toan ban) or (toan cao))*.