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
cac dau » cac dan, cac du, cac dai
dau gia » danh gia, cau giay, mau giao
ve cac » va cac, vien cac
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 dau 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 dau 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 dau gia hanh vi cau tren*.