Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
co hoi » co hoc, co loi
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
ve cam » ve cham, ve cac, va cam
o hoi » o hoc, o hai, o hoa

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) OR (co hoi)). hieu ve 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) OR (co hoi)). hieu ve 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) OR (co hoi)). hieu ve cam xuc va dan vi ((cua te) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang ((o hoi) OR (co hoi)). hieu ve cam xuc va dan vi ((cua te) or (va trien))*.