Perhaps you should try some spelling variations:
sach tham » sach nha
gia hanh » gia thanh, giao hanh, gia anh
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
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 y))) or (sach tham)) lang xa hoi. hieu ve cac du gia hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach y))) OR (sach tham)) lang xa hoi. hieu ve cac du gia hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((((sach ky) OR (sach y))) or (sach tham)) lang xa hoi. hieu ve cac du gia hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) OR (sach y))) or (sach tham)) lang xa hoi. hieu ve cac du gia hanh vi cau tren*.