Perhaps you should try some spelling variations:
cong cong » cong dong, trong cong, dung cong
cach thoi » cac thoi, cach thuc, cach noi
hoc khoi » hoc khoa, hoc hoa, hoc noi
ban vat » bang vat, ben vat, ban va
te cong » tai cong, thi cong, thu cong
vat y » vat ly, vat _
tuyen » truyen, quyen

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tuyen tap ((hoc khoi) or (cach thoi)) đe co ban vat y te cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen tap ((hoc khoi) OR (cach thoi)) đe co ban vat y te cong cong.
• Adding a wildcard symbol may retrieve word variants: tuyen tap ((hoc khoi) or (cach thoi)) đe co ban vat y te cong cong*.