Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
luc phan » duc phan, luc nhan, luan phan
dang va » dang van, dang vat, dung va
cau luc » cau truc, cau phuc
sach tu » sach thu, cach tu, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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 tu ((nang xa) or (lang xa)) hoi. hieu ve cau luc phan ((dang va) OR (hang va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang xa) OR (lang xa)) hoi. hieu ve cau luc phan ((dang va) OR (hang va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((nang xa) or (lang xa)) hoi. hieu ve cau luc phan ((dang va) OR (hang va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang xa) or (lang xa)) hoi. hieu ve cau luc phan ((dang va) OR (hang va)) cau tren*.