Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
su sach » so sach, vu sach
bac tuc » bac tu, bac thua
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
so sanh » do sanh
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) OR (bach tuoc)) 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) OR (bach tuoc)) xa thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) vu nang xa hoi. hieu van ((bac tuc) OR (bach tuoc)) 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) OR (bach tuoc)) xa thanh vi cua tre*.