Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doc hieu » toc thieu, hoc thieu
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
cong san » cong tac
san phan » san pham, van phan, sat phan
phan dau » phan tu, hang dau

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

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