Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xa thanh » va thanh, ha thanh, ta thanh
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
so sanh » do sanh
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
bac tuc » bac tu, bach tuoc, bac thua
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: ((su sach) or (so sanh)) vu nang xa hoi. hieu van bac tuc xa thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) vu nang xa hoi. hieu van bac tuc xa thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) vu nang xa hoi. hieu van bac tuc xa thanh vi cua tre*.