Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trung cao » truong cao, trung cap, trung co
cao thong » cao thuong, tao thong, cao phong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
gian cac » gian dan, gian cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - thanh trung cao thong ((cong dan) OR (cong san)) gian cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - thanh trung cao thong ((cong dan) OR (cong san)) gian cac".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung cao thong ((cong dan) OR (cong san)) gian cac*.