Perhaps you should try some spelling variations:
nghiem tu » nghiep tu, nghiem su, nghiem te
ha nghiem » khao nghiem, thi nghiem, thu nghiem
sach dao » lanh dao
hoach ha » hoach va, hoach xay, hoach hoi
sach da » sach dat, sach dau, sach xa
de hoc » te hoc, du hoc, dien hoc
tu hoc » te hoc
d hoc » du hoc, ad hoc, y 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 ((sach da) OR (sach dao)) nghe ((d hoc) or (de hoc)) ) or ( thu hoach ha nghiem tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((sach da) OR (sach dao)) nghe ((d hoc) OR (de hoc)) ) OR ( thu hoach ha nghiem tu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu ((sach da) OR (sach dao)) nghe ((d hoc) or (de hoc)) ) or ( thu hoach ha nghiem tu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu ((sach da) OR (sach dao)) nghe ((d hoc) or (de hoc)) ) or ( thu hoach ha nghiem tu hoc ))*.