Perhaps you should try some spelling variations:
thieu tinh » chieu tinh, thien tinh, lieu tinh
trung tuan » trung thanh, trung tam, tran tuan
trung cap » truong cao, trung tam
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 tinh) OR (trieu tinh)) - thanh ((trung tuan) or (trung cap)) dung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (trieu tinh)) - thanh ((trung tuan) OR (trung cap)) dung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu tinh) OR (trieu tinh)) - thanh ((trung tuan) or (trung cap)) dung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) OR (trieu tinh)) - thanh ((trung tuan) or (trung cap)) dung cong dan toan cao*.