Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
thong dong » thong duong, thong cong, thong dung
hieu lang » chieu sang, hieu quang, nhieu tang
dang tran » dang thanh, quang tran, hoang tran
bong toan » cong toan, phong toan, trong toan
tranh va » tranh van, trang va, trinh va
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh tranh va ((thong dong) OR (thuong dong)) ((dang tran) or (bong toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh va ((thong dong) OR (thuong dong)) ((dang tran) OR (bong toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh tranh va ((thong dong) OR (thuong dong)) ((dang tran) or (bong toan)) tap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh va ((thong dong) OR (thuong dong)) ((dang tran) or (bong toan)) tap*.