Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
luc ngan » luc nganh, luc nhan, luat ngan
cau luc » cau truc, cau phuc
ca tren » cau tren, cu tren, co tren
hang vi » hang va, hanh vi, hang di
la tren » loai tren, dua tren, dat tren
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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) OR (sach thu)) nang x hoi. hieu va cau luc ngan hang vi ((ca tren) or (la tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach thu)) nang x hoi. hieu va cau luc ngan hang vi ((ca tren) OR (la tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) OR (sach thu)) nang x hoi. hieu va cau luc ngan hang vi ((ca tren) or (la tren))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) OR (sach thu)) nang x hoi. hieu va cau luc ngan hang vi ((ca tren) or (la tren))*.