Perhaps you should try some spelling variations:
chang dam » chang ham, hang dam, hang dau
ban chang » ban hang, san chang, ban chan
su sach » so sach, vu sach
ky lang » ky dang, tay lang
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
so viet » hoc viet
va cam » va cham, va cac, va cao
dam so » dai so, nam so, dap so

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 ((((ky lang) OR (ky tang))) or (ky nang)) xa hoi. hieu va cam xuc ban chang dam so viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ky lang) OR (ky tang))) OR (ky nang)) xa hoi. hieu va cam xuc ban chang dam so viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((ky lang) OR (ky tang))) or (ky nang)) xa hoi. hieu va cam xuc ban chang dam so viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((((ky lang) OR (ky tang))) or (ky nang)) xa hoi. hieu va cam xuc ban chang dam so viet*.