Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » trong cong, dung cong, dang cong
cac chu » cac che, ca chu, cac cau
cac khu » cac khoi, cac kieu
cac thu » cach thuc, cac thoi
ban vat » bang vat, ben vat, ban va
vat y » vat ly, vat _
dong » dung

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