Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien anh » hien hanh, thien anh, dien anh
trang va » hang va
tran van » luan van
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 hien anh - thanh ((trang va) OR (tran van)) nhung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien anh - thanh ((trang va) OR (tran van)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien anh - thanh ((trang va) OR (tran van)) nhung cong dan toan cao*.