Perhaps you should try some spelling variations:
cong cong » cong dong, trong cong, dung cong
cao bang » cao dang, cao tang, cao nang
cac khu » cac khoi, cac kieu
te cong » tai cong, thi cong, thu cong
co bana » co ban, cho band
co bang » con bang, co ban, do bang
cac thu » cach thuc, cac thoi
vat y » vat ly, vat _
tuyen » truyen, quyen

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

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