Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » hieu va, thien van, lieu va
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua te » cua tu
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ky nang o hoi. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang o hoi. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang o hoi. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang o hoi. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) or (va trien))*.