Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
thanh va » thanh van, hanh va, thanh ha
sach thu » sach thue, sach thieu, sach tham
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ve cac » va cac, vien cac
du gia » duc gia, dau gia, vu gia

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