Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
luc ngan » luc nganh, luc nhan, luat ngan
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
hang di » hang doi, hang vi, hang dien
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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 ty ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cau luc ngan hang di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu van)) cau luc ngan hang di cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cau luc ngan hang di cau tren*".