Perhaps you should try some spelling variations:
van quang » van quan, tran quang, van tuan
ban hanh » ban hang
truc ban » thuc ban, truc dan, truc van
nam truc » nam truoc, nam thuc, nam trung
so sach » so sanh, bo sach, co sach
hanh de » hanh ve, hanh kem
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu van
de cuu » de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((van ban) or (van quang)) x ho. ((hieu ve) OR (hieu va)) nam truc ban hanh de cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((van ban) OR (van quang)) x ho. ((hieu ve) OR (hieu va)) nam truc ban hanh de cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((van ban) or (van quang)) x ho. ((hieu ve) OR (hieu va)) nam truc ban hanh de cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((van ban) or (van quang)) x ho. ((hieu ve) OR (hieu va)) nam truc ban hanh de cuu tre*.