Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
su sach » so sach, vu sach
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
xuc ban » duc ban, cuc ban, xuat ban
cua tre » cua te, cuu tre, cua triet
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di 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 bach)) ty lang xa hoi. hieu van nam ((xuc ban) OR (quoc ban)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ty lang xa hoi. hieu van nam ((xuc ban) OR (quoc ban)) anh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) ty lang xa hoi. hieu van nam ((xuc ban) OR (quoc ban)) anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) ty lang xa hoi. hieu van nam ((xuc ban) OR (quoc ban)) anh vi cua tre*.