Perhaps you should try some spelling variations:
xay nghiem » xet nghiem, day nghiep, van nghiem
dao nghe » day nghe, da nghe, dat nghe
tu lanh » tu lenh, tu manh, tu anh
tu hanh » du hanh, lu hanh, thuc hanh
nghe d » nghe di, nghe _, nghe 新
su hoc » tu hoc, du hoc, su ho
so hoc » co hoc, mo hoc, so hoa
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 lanh) OR (tu hanh)) dao nghe d hoc ) or ( thu hoach xay nghiem ((su hoc) or (so hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu lanh) OR (tu hanh)) dao nghe d hoc ) OR ( thu hoach xay nghiem ((su hoc) OR (so hoc)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tu lanh) OR (tu hanh)) dao nghe d hoc ) or ( thu hoach xay nghiem ((su hoc) or (so hoc)) ))".
• Adding a wildcard symbol may retrieve word variants: (( ((tu lanh) OR (tu hanh)) dao nghe d hoc ) or ( thu hoach xay nghiem ((su hoc) or (so hoc)) ))*.