Perhaps you should try some spelling variations:
cong cong » cong dong, trong cong, dung cong
cong dung » cuong dung, cong dong, cong luong
dung vat » dung va, dong vat, dung dat
cac thu » cach thuc, cac thoi
te cong » tai cong, thi cong, thu cong
cac khu » cac khoi, cac kieu
cac chu » cac che, ca chu, cac cau
vat y » vat ly, vat _

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

• Performing a fuzzy search may retrieve terms with similar spellings: (tuyen or quyen) tap ((((cac chu) OR (cac khu))) or (cac thu)) đe cong dung vat y te cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (tuyen OR quyen) tap ((((cac chu) OR (cac khu))) OR (cac thu)) đe cong dung vat y te cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(tuyen or quyen) tap ((((cac chu) OR (cac khu))) or (cac thu)) đe cong dung vat y te cong cong".
• Adding a wildcard symbol may retrieve word variants: (tuyen or quyen) tap ((((cac chu) OR (cac khu))) or (cac thu)) đe cong dung vat y te cong cong*.