Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
_ dan » _ dau

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