Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo yeu » theo tieu, thiet yeu, theo chu
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
theo te » theo tu, theo tieu
luan » quan, lan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo te) OR (theo yeu)) sach - thanh ((trung va) OR (luan van)) nhung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo te) OR (theo yeu)) sach - thanh ((trung va) or (luan van)) nhung cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((theo te) OR (theo yeu)) sach - thanh ((trung va) or (luan van)) nhung cong dan toan cao*.