Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
dung cong » dung trong
cao bang » cao dang, cao tang, cao nang
cac khu » cac khoi, cac kieu
cac thu » cach thuc, cac thoi
co bang » con bang, co ban, co bana
te dung » tieu dung, tien dung, tin dung
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: quyen tap ((cac khu) or (cac thu)) đe ((co bang) OR (cao bang)) vat y te dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac khu) OR (cac thu)) đe ((co bang) OR (cao bang)) vat y te dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((cac khu) or (cac thu)) đe ((co bang) OR (cao bang)) vat y te dung cong".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac khu) or (cac thu)) đe ((co bang) OR (cao bang)) vat y te dung cong*.