Perhaps you should try some spelling variations:
thien van » thi van
van dinh » van minh, van dich, va dinh
chat duc » chat xuc, chat doc, chet duoc
hieu van » hieu va, lieu va, hieu ve
su sach » so sach
dinh va » dinh van, dinh ve, tinh va
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca 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 (vu sach)) y nang xa hoi. ((hieu van) OR (thien van)) chat duc van dinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang xa hoi. ((hieu van) OR (thien van)) chat duc van dinh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang xa hoi. ((hieu van) OR (thien van)) chat duc van dinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang xa hoi. ((hieu van) OR (thien van)) chat duc van dinh va cua tre*.