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, nam thu, nam tu
thanh vi » hanh vi, thanh va, thanh ve
te sach » toc sach
bo sach » co 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 (bo sach)) ky nang xa hoi. hieu van ((nam thuc) OR (am thuc)) dan thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (bo sach)) ky nang xa hoi. hieu van ((nam thuc) OR (am thuc)) dan thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (bo sach)) ky nang xa hoi. hieu van ((nam thuc) OR (am thuc)) dan thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (bo sach)) ky nang xa hoi. hieu van ((nam thuc) OR (am thuc)) dan thanh vi cua tre*.