Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
quoc ban » quoc bao, quoc lan, quoc quan
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
xuc ban » duc ban, cuc ban, xuat ban
hieu va » lieu va, hieu qua
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
va cam » va cham, va cac, va cao
ca hoi » cau hoi, cua hoi, xa hoi

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 ty hang ca hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh tai ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang ca hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh tai ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang ca hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh tai ((cau treo) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang ca hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh tai ((cau treo) or (cau theo))*.