Perhaps you should try some spelling variations:
nghiem tu » nghiep tu, nghiem su, nghiem te
ha nghiem » khao nghiem, thi nghiem, thu nghiem
hoach ha » hoach va, hoach xay, hoach hoi
nam nghe » nang nghe, van nghe
cac nam » bac nam, cac cam, cac ham
nghe d » nghe di, nghe _, nghe 新
tu hoc » te hoc
d hoc » du hoc, ad hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac nam nghe d hoc ) or ( thu hoach ha nghiem tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac nam nghe d hoc ) OR ( thu hoach ha nghiem tu hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu cac nam nghe d hoc ) or ( thu hoach ha nghiem tu hoc ))*.