Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
hien hanh » dieu hanh
lang cong » bang cong, hang cong, lang dong
dang cong » dung cong
tuong va » truong va, thuong va, luong va
van chat » cao chat
chat tap » chat tai, chat thai, chat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - thanh tuong va ((lang cong) or (dang cong)) van chat tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - thanh tuong va ((lang cong) OR (dang cong)) van chat tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - thanh tuong va ((lang cong) or (dang cong)) van chat tap*.