Perhaps you should try some spelling variations:
thi nghiem » thuc nghiem
hoach thi » hoach thu, hoach toi, hoach thay
dien hoc » dien hoa, khien hoc, tin hoc
dao nghe » day nghe, da nghe, dat nghe
tu lanh » tu hanh, tu lenh, tu manh
de hoc » te hoc
du hoc » tu hoc, duoc hoc
so hoc » co hoc, mo hoc, so hoa

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 ((de hoc) OR (dien hoc)) ) or ( thu hoach thi nghiem ((du hoc) or (so hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu lanh dao nghe ((de hoc) OR (dien hoc)) ) OR ( thu hoach thi nghiem ((du hoc) OR (so hoc)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu lanh dao nghe ((de hoc) OR (dien hoc)) ) or ( thu hoach thi nghiem ((du hoc) or (so hoc)) ))*".