Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
hieu ve » hieu va
xuc van » duc van, luc van, vuc van
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, 5 hoi

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 nang ((x hoi) or (x ho)). ((hieu ve) or (hieu van)) cam xuc van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ((x hoi) OR (x ho)). ((hieu ve) OR (hieu van)) cam xuc van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ((x hoi) or (x ho)). ((hieu ve) or (hieu van)) cam xuc van hanh vi cua viet*.