Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
cau tren » cu tren, dau tren, ca tren
cau treo » cau theo, cau triet, cau trieu
sach thu » sach thue, sach thieu, sach tham
xuc ban » duc ban, cuc ban, quoc ban
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
va cam » va cham, va cac, va cao

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