Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » thong cong, hang cong, nhung don
thieu anh » thien anh, chieu xanh, thien danh
hien hanh » dieu hanh
dung cong » dung trong
trung va » truong va, trang va, trung ha
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu anh) or (hien hanh)) - thanh trung va ((nhung cong) or (dung cong)) dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu anh) OR (hien hanh)) - thanh trung va ((nhung cong) OR (dung cong)) dan khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu anh) or (hien hanh)) - thanh trung va ((nhung cong) or (dung cong)) dan khan cap*.