Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, quoc ban
duc van » duc va, duc tan, duc manh
van cac » van hac, van cau, van bac
tu sach » thu sach, su sach, te sach
tu nang » tru nang, tu nano, tu lang
tu nong » tu dong, tu cong, tu tong
cua tre » cua te, cuu tre, cua triet
anh ca » danh ca, anh cam, anh cua
ca cua » co cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu nang) OR (tu nong)) x hoi. hieu van cac ((duc van) or (xuc ban)) anh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nong)) x hoi. hieu van cac ((duc van) OR (xuc ban)) anh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) OR (tu nong)) x hoi. hieu van cac ((duc van) or (xuc ban)) anh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) OR (tu nong)) x hoi. hieu van cac ((duc van) or (xuc ban)) anh ca cua tre*.