Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach kem
van cau » van dau, van hau, van chat
va tinh » may tinh
va kinh » qua kinh
cac loc » cac lop, cac toc, cac hoc
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
sach ty » sach y, sach tu, sach thu
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

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