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

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