Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
dieu tinh » lieu tinh, dien tinh, kieu tinh
trung hat » trung nhat, trung phat, trung hai
trung ha » trung hoc, trung tam, trung cap
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 ((dieu tinh) OR (diep tinh)) - hanh ((trung ha) or (trung hat)) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu tinh) OR (diep tinh)) - hanh ((trung ha) OR (trung hat)) nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((dieu tinh) OR (diep tinh)) - hanh ((trung ha) or (trung hat)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu tinh) OR (diep tinh)) - hanh ((trung ha) or (trung hat)) nhung cong dan toan cao*.