Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu nganh » hiem ngan, hieu manh, nghiep nganh
vien nganh » vien thanh
dang cong » dung cong
trung ha » trung hoc, trung tam, trung cap
cong san » cong tac
than cao » toan cao, than cap, than sao
thai cao » tai cao, thoai cac, thuat cao
ha dang » hai dang, ha dong, ha tang

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

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