Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cao duc » dao duc, cao suc, giao duc
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
hieu ve » hieu van
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua
dan di » danh di, dan da, dan de
va dan » ca dan, va dao, va dau
cua te » cua tu

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 ((ty nang) or (ty hang)) xa hoi. ((hieu ve) or (hieu va)) cao duc va dan di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty hang)) xa hoi. ((hieu ve) OR (hieu va)) cao duc va dan di cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty hang)) xa hoi. ((hieu ve) or (hieu va)) cao duc va dan di cua te*.