Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chat thuc » thuat thuc, nhan thuc, chat thai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
vanh dai » van dai, vanh tai, lanh dao
ly nang » ky nang, ly hang, ly vang
thuc va » thuc vat, thuc dan, thuc day
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((y nang) OR (ly nang)) xa hoi. hieu van chat thuc va ((vanh dai) or (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (ly nang)) xa hoi. hieu van chat thuc va ((vanh dai) OR (danh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) OR (ly nang)) xa hoi. hieu van chat thuc va ((vanh dai) or (danh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) OR (ly nang)) xa hoi. hieu van chat thuc va ((vanh dai) or (danh di)) cua tre*.