Perhaps you should try some spelling variations:
ngheo nano » nghe nano, ngheo bang
hiem ngheo » giam ngheo, nhiem nghe
cua triet » cua viet, su triet, va triet
nano thu » nang thuc, ngo thu, ban thu
danh sai » dung sai, danh bat, danh dau
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, me hoi
y nang » ky nang, ly nang, v nang
thu va » thuc va, thue va, tu va

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