Perhaps you should try some spelling variations:
nano thue » nang thuc, dan thue, nam thue
nghe nano » nghe dan, nghe san, nghe nhan
hieu nghe » lieu nghe, hiem ngheo, nhiem nghe
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, xa hoi, me hoi

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 y nang ((ma hoi) or (ma hoa)). hieu nghe nano thue ((va danh) OR (va dan)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (ma hoa)). hieu nghe nano thue ((va danh) OR (va dan)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((ma hoi) or (ma hoa)). hieu nghe nano thue ((va danh) OR (va dan)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (ma hoa)). hieu nghe nano thue ((va danh) OR (va dan)) sai cua tre*.