Perhaps you should try some spelling variations:
thu nghiem » thuc nghiem, thi nghiem
hoach thu » hoach thay, doanh thu, hoach su
nghiem su » nghiem xu, nghiem ngu, nghiem dau
bai nghe » thai nghe, van nghe, cap nghe
nam nghe » nang nghe, van nghe
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
su hoc » tu hoc, du hoc, so 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 sach) or (su sach)) ((bai nghe) or (nam nghe)) d hoc ) or ( thu hoach thu nghiem su hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu sach) OR (su sach)) ((bai nghe) OR (nam nghe)) d hoc ) OR ( thu hoach thu nghiem su hoc )).
• Adding a wildcard symbol may retrieve word variants: (( ((tu sach) or (su sach)) ((bai nghe) or (nam nghe)) d hoc ) or ( thu hoach thu nghiem su hoc ))*.