Perhaps you should try some spelling variations:
dang xay » dang van, van xay
luc ngan » luc nganh, luc nhan, luat ngan
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
mang xa » lang xa, mang may, mang cua
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
hang di » hang doi, hang vi, hang dien
ve cau » ke cau, va cau, ve cac
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 y ((mang xa) or (dang xay)) hoi. hieu ve cau luc ngan hang di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((mang xa) OR (dang xay)) hoi. hieu ve cau luc ngan hang di cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((mang xa) or (dang xay)) hoi. hieu ve cau luc ngan hang di cau tren*.