Perhaps you should try some spelling variations:
thuoc cong » truoc cong, thuoc trong, thu cong
quyen tap » tuyen tap, quyen cap, huyen tam
cong dung » cuong dung, cong dong, cong luong
luyen tap » tuyen tap, luyen thi
cac chu » cac thu, cac che, ca chu
cac khu » cac thu, cac khoi, cac kieu
vat y » vat ly, vat _
va y » va ky, va my, va ly

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