Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
van thanh » ban thanh, van tuan
so sach » bo sach, co sach, hoc sach
van cua » vang cua, ban cua, dan cua
duc van » duc va, duc tan, duc manh
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
y nang » ky nang, ly nang, v nang

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

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