Perhaps you should try some spelling variations:
dao thanh » ban thanh, tro thanh, de thanh
dat thanh » dat khanh, dang thanh, danh thanh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
su sach » vu sach
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
ve cuu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky nang xa hoi. hieu van nam thuc ((dat thanh) or (dao thanh)) ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang xa hoi. hieu van nam thuc ((dat thanh) OR (dao thanh)) ve cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang xa hoi. hieu van nam thuc ((dat thanh) or (dao thanh)) ve cuu tre*.