Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
luc ngan » luc nganh, luc nhan, luat ngan
ca tren » cu tren, la tren, co tren
hang vi » hang va, hanh vi, hang di
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
xang xa » lang xa, mang xa, ang xa
te sach » toc sach
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) or (te sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi ((ca tren) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi ((ca tren) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi ((ca tren) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi ((ca tren) OR (cau tren))*.