Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
qua cac » cua cac
xuc van » duc van, luc van, vuc van
hanh di » hanh vi, hanh de, hang di
di cau » da cau, diem 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 ((lang xa) or (lang van)) hoi. hieu qua cac ((xuc van) or (duc tan)) hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (lang van)) hoi. hieu qua cac ((xuc van) OR (duc tan)) hanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (lang van)) hoi. hieu qua cac ((xuc van) or (duc tan)) hanh di cau tren*.