Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
dai trong » tai trong, bai trong, dai tuong
sach thu » sach thieu, sach tham, cach thuc
luc ngan » luc nganh, luc nhan, luat ngan
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
ve cau » ke cau, va cau, ve cac
vi dai » si dai, li dai, vien dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach thu) or (sach thue)) nang xa hoi. hieu ve cau luc ngan hang vi dai trong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) nang xa hoi. hieu ve cau luc ngan hang vi dai trong.
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (sach thue)) nang xa hoi. hieu ve cau luc ngan hang vi dai trong*.