Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thu sach » thuat sach, thuoc sach, thu hoach
thu bang » thu ban, thu hang, chu bang
danh vai » danh sai, danh va, doanh van
cham tuc » nham thuc, pham thuc, tham thuc
hieu va » lieu va, hieu qua
vai cau » va cau, van cau, vai cac
va danh » va dinh, va dan, va hanh
tu sach » su sach, te sach, tu cach
hieu ve » hieu van
tuc va » thuc va, truc va, tuc xa
bang x » nang x, bang _, bang 2
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) OR (thu sach)) thu bang x hoi. ((hieu ve) or (hieu va)) cham tuc va danh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thu bang x hoi. ((hieu ve) OR (hieu va)) cham tuc va danh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) thu bang x hoi. ((hieu ve) or (hieu va)) cham tuc va danh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) thu bang x hoi. ((hieu ve) or (hieu va)) cham tuc va danh vai cau tren*.