Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
luc ngan » luc nganh, luc nhan, luat ngan
dang xay » dang van, van xay
hang vi » hanh vi, hang di, khang voi
cau luc » cau truc, cau phuc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac

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