Perhaps you should try some spelling variations:
hien nghe » hiem ngheo, nhiem nghe, gian nghe
nhung bo » nhung bi, nhung bai, nhung don
te sach » toc sach
su sach » so sach
vu sach » vu bach, vu khach
nha hoc » nha thuoc, khoa hoc, nha nuoc
nghe va » nghe dan
bo co » bao co, vo co, co co
co vi » co vai, co va, co gi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (((su sach) OR (vu sach)))) nha hoc hien nghe va ets : nhung bo co vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((su sach) OR (vu sach)))) nha hoc hien nghe va ets : nhung bo co vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (((su sach) OR (vu sach)))) nha hoc hien nghe va ets : nhung bo co vi đai".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((su sach) OR (vu sach)))) nha hoc hien nghe va ets : nhung bo co vi đai*.