Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
xa thanh » va thanh, ha thanh, ta thanh
vu sach » vu bach, su sach, vu khach
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
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sanh)) vu nang xa hoi. hieu van ((bac tuc) or (bach tuoc)) xa thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) vu nang xa hoi. hieu van ((bac tuc) OR (bach tuoc)) xa thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) vu nang xa hoi. hieu van ((bac tuc) or (bach tuoc)) xa thanh di cua tre*.