Perhaps you should try some spelling variations:
tong cong » trong cong, cong cong, dung cong
doc hieu » hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) OR (toc thieu)) sach - canh tranh va tong cong dan phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) sach - canh tranh va tong cong dan phan cac".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) sach - canh tranh va tong cong dan phan cac*.