Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
dan thanh » danh thanh, ban thanh, van thanh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
te sach » toc sach
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
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)) ky nang xa hoi. hieu van nam thuc ((dan thanh) OR (dang thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang xa hoi. hieu van nam thuc ((dan thanh) OR (dang thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sach)) ky nang xa hoi. hieu van nam thuc ((dan thanh) OR (dang thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang xa hoi. hieu van nam thuc ((dan thanh) OR (dang thanh)) vi cua tre*.