Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
cau tren » cu tren, ca tren, cau treo
luc ngan » luc nganh, luc nhan, luat ngan
dau tren » dau tien, dat tren, dau tieng
sach ty » sach y, sach tu, sach thu
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac
ang xa » lang xa, mang xa, hoang xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((ang xa) or (dang xay)) hoi. hieu ve cau luc ngan hang vi ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((ang xa) OR (dang xay)) hoi. hieu ve cau luc ngan hang vi ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((ang xa) or (dang xay)) hoi. hieu ve cau luc ngan hang vi ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((ang xa) or (dang xay)) hoi. hieu ve cau luc ngan hang vi ((cau tren) OR (dau tren))*.