Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
thong cong » trong cong, tong cong, thong thong
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

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