Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
thuc dao » thuc dan, thuc day, chuc dao
dao danh » dao doanh, do danh, dao dan
danh dai » danh dau, danh di, danh sai
tu sach » thu sach, su sach, te sach
ly nang » ly hang, ly vang, ly quang
cua tre » cua te, cuu tre, cua triet

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 ((((ly nang) OR (ky nang))) or (ty xang)) xa hoi. hieu van chat thuc dao danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((ly nang) OR (ky nang))) OR (ty xang)) xa hoi. hieu van chat thuc dao danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((((ly nang) OR (ky nang))) or (ty xang)) xa hoi. hieu van chat thuc dao danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((((ly nang) OR (ky nang))) or (ty xang)) xa hoi. hieu van chat thuc dao danh dai cua tre*.