Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
luc ngan » luc nganh, luc nhan, luat ngan
cau tren » dau tren, ca tren, cau treo
hang di » hang doi, hang dien, hang dich
sach ty » sach y, sach tu, sach thu
hang vi » hang va, hanh vi, khang voi
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
xang xa » lang xa, mang xa, ang xa
cu tren » tu tren, dua tren
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: thuoc sach ty xang xa hoi. hieu ve cau luc ngan ((hang vi) or (hang di)) ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty xang xa hoi. hieu ve cau luc ngan ((hang vi) OR (hang di)) ((cau tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty xang xa hoi. hieu ve cau luc ngan ((hang vi) or (hang di)) ((cau tren) or (cu tren))*.