Perhaps you should try some spelling variations:
hoc trong » hoc thuong, hoc tieng, dot trong
cac thoi » cac toi, cac hop, cac tro
cac khoi » cac khoan, cach thoi, hoc khoi
cac che » cac he, cac chien, cac chat
ban ve » ban va
ky hoc » y hoc, ly hoc, ky hoa
ve ky » va ky, ke ky
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 ((cac che) or (((cac khoi) OR (cac thoi)))) đe co ban ve ky hoc trong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen tap ((cac che) OR (((cac khoi) OR (cac thoi)))) đe co ban ve ky hoc trong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tuyen tap ((cac che) or (((cac khoi) OR (cac thoi)))) đe co ban ve ky hoc trong cong".
• Adding a wildcard symbol may retrieve word variants: tuyen tap ((cac che) or (((cac khoi) OR (cac thoi)))) đe co ban ve ky hoc trong cong*.