Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc hieu » hoc thieu, doc hieu, hoc dieu
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 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 hieu) or (hoc hien)) manh - thanh ((trung va) OR (trung ha)) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc hien)) manh - thanh ((trung va) OR (trung ha)) nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (hoc hien)) manh - thanh ((trung va) OR (trung ha)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc hien)) manh - thanh ((trung va) OR (trung ha)) nhung cong dan toan cao*.