Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
chu nang » chuc nang, chua nang, cuu nang
danh tu » anh tu, doanh thu
danh du » danh dau, dinh du, anh du
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
tu sach » su sach, te sach, tu cach
ca cua » co cua
va ca » va cac, va cao, va cai
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) chu nang x hoi. hieu va ca cua ban ((danh du) OR (danh tu)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) chu nang x hoi. hieu va ca cua ban ((danh du) OR (danh tu)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) chu nang x hoi. hieu va ca cua ban ((danh du) OR (danh tu)) cuu tre*.