Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
cong ngang » cong nhan, cong quang, cong lang
hien hanh » dieu hanh
dien anh » tieng anh, dien dan
trung va » truong va, trang va, trung ha
tan cao » toan cao, tay cao, tan ca
tao cao » bao cao, toan cao

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

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