Perhaps you should try some spelling variations:
quyen cap » quyen cach, huyen cao, quyen con
luyen tap » tuyen tap, luyen thi
cong cong » cong dong, trong cong, dung cong
cac che » cac he, cac chien, cac chat
te cong » tai cong, thi cong, thu cong
co ben » co benh, co ban, do ben
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 cap) or (luyen tap)) cac che đe co ben vat y te cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((quyen cap) OR (luyen tap)) cac che đe co ben vat y te cong cong.
• Adding a wildcard symbol may retrieve word variants: ((quyen cap) or (luyen tap)) cac che đe co ben vat y te cong cong*.