Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
thanh vi » hanh vi, thanh va, thanh ve
te sach » toc sach
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

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