Perhaps you should try some spelling variations:
trung tuan » trung thanh, tran tuan, truong thanh
tieu tinh » trieu tinh, tieu trinh, lieu tinh
dung cong » dung trong
hoc tieu » hoc thieu, hoc dieu, hoc sieu
cong dan » cong san, cong tan, huong dan
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tieu tinh - hanh ((trung tuan) OR (trung tam)) dung cong dan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tieu tinh - hanh ((trung tuan) OR (trung tam)) dung cong dan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tieu tinh - hanh ((trung tuan) OR (trung tam)) dung cong dan ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc tieu tinh - hanh ((trung tuan) OR (trung tam)) dung cong dan ((toan cao) or (toan tap))*.