Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
cong quang » luong quang, thong quang, duong quang
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trung dap » trung cap, trung dai, trung dam
cong cong » cong dong, trong cong, dung cong
dap cong » tap cong, dai cong, dam cong
thong tu » thong tin, thong ke
tuc » thuc, truc

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - thanh trung dap cong cong quang ((thong tu) or (phong tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - thanh trung dap cong cong quang ((thong tu) OR (phong tuc)).
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh trung dap cong cong quang ((thong tu) or (phong tuc))*.