Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
xuc van » duc van, luc van, vuc van
kem va » kiem va, kiem van
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: so sach thu nang x hoi. ((hieu quan) or (hieu qua)) chat xuc van hanh kem va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang x hoi. ((hieu quan) OR (hieu qua)) chat xuc van hanh kem va triet.
• Adding a wildcard symbol may retrieve word variants: so sach thu nang x hoi. ((hieu quan) or (hieu qua)) chat xuc van hanh kem va triet*.