Perhaps you should try some spelling variations:
nghe nhan » nghe dan, nghe san
nghe nano » nghe dan, nghe san
danh sai » dung sai, danh bat, danh dau
tu sach » thu sach, su sach, te sach
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
thue va » thuc va, thuyet va, thuc vat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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) OR (nghe nhan)) thue va danh 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) OR (nghe nhan)) thue va danh 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) OR (nghe nhan)) thue va danh sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (ma hoa)). hieu ((nghe nano) OR (nghe nhan)) thue va danh sai cua tre*.