Perhaps you should try some spelling variations:
nghe nano » nghe dan, nghe san, nghe nhan
lieu nghe » lieu nhe, lieu nghien, lieu nha
nano thu » nang thuc, ngo thu, ban thu
dung sai » dung tai, dung va, dung dat
danh sai » danh bat, danh dau, hanh san
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu va
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 ky nang ((ma hoi) or (ma hoa)). lieu nghe nano thu va ((danh sai) OR (dung sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (ma hoa)). lieu nghe nano thu va ((danh sai) OR (dung sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (ma hoa)). lieu nghe nano thu va ((danh sai) OR (dung sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (ma hoa)). lieu nghe nano thu va ((danh sai) OR (dung sai)) cua tre*.