Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thang cua » thong cua, hang cua, than cua
hieu van » hieu va, thien van, hieu ve
va thanh » gia thanh, va tinh, le thanh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu van) or (lieu va)) bac xuc ((va thanh) OR (ban thanh)) thang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu van) OR (lieu va)) bac xuc ((va thanh) OR (ban thanh)) thang cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu van) or (lieu va)) bac xuc ((va thanh) OR (ban thanh)) thang cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu van) or (lieu va)) bac xuc ((va thanh) OR (ban thanh)) thang cua tre*.