Perhaps you should try some spelling variations:
truong tham » truong ham, truong thanh, truong thpt
chieu sang » chieu sach, chieu xanh, hieu lang
tuong tham » luong tham, tuong tac, trong thai
doi chieu » doc hieu, doi chi, ho chieu
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, toan ban
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 - manh ((truong tham) OR (tuong tham)) hang cong dan ((toan tai) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - manh ((truong tham) OR (tuong tham)) hang cong dan ((toan tai) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - manh ((truong tham) OR (tuong tham)) hang cong dan ((toan tai) or (toan cao))*.