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