Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » trong cong, dung cong, dang cong
tap cac » tai cac, tap trac
cac chu » cac thu, cac che, cac khu
ban vat » bang vat, ben vat, ban va
vat y » vat ly, vat _
y thi » ky thi, y thai, ly thi
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 đe co ban vat y thi ((cong cong) OR (cong dong))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap cac chu đe co ban vat y thi ((cong cong) OR (cong dong))".
• Adding a wildcard symbol may retrieve word variants: quyen tap cac chu đe co ban vat y thi ((cong cong) OR (cong dong))*.