Perhaps you should try some spelling variations:
thuong tham » tuong tham, thuong thay, thuong thuat
thuong pham » thuong phat, phuong phap, nhung pham
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
dang cong » dung cong
cong dan » cong san, cong tan, huong dan
toan cao » toan ban, 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: doi chieu sang - anh ((thuong tham) OR (thuong pham)) dang cong dan ((van ban) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - anh ((thuong tham) OR (thuong pham)) dang cong dan ((van ban) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - anh ((thuong tham) OR (thuong pham)) dang cong dan ((van ban) or (toan cao))*.