Perhaps you should try some spelling variations:
sach tham » sach nha
thanh vi » hanh vi, thanh va, thanh ve
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
du gia » duc gia, dau gia, vu gia
vi cau » va cau, ve cau, di cau

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 ky) or (sach tham)) lang xa hoi. ((hieu ve) OR (hieu va)) cac du gia thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach tham)) lang xa hoi. ((hieu ve) OR (hieu va)) cac du gia thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach tham)) lang xa hoi. ((hieu ve) OR (hieu va)) cac du gia thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach tham)) lang xa hoi. ((hieu ve) OR (hieu va)) cac du gia thanh vi cau tren*.