Perhaps you should try some spelling variations:
ha nghiem » khao nghiem, thi nghiem, thu nghiem
hoach ha » hoach va, hoach xay, hoach hoi
dao nghe » day nghe, da nghe, dat nghe
tu lanh » tu hanh, tu lenh, tu manh
nghe xu » nghe thu
xu hoc » du hoc, su hoc, xa hoc
tu hoc » te hoc
su ho » su hoa, su hoc, su pho

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

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