Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dieu cua » dieu tra
va danh » va dinh, va dan, va hanh
cau xuc » cam xuc, cau luc, cau truc
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((xa hoi) or (o hoc)). hieu van cau xuc va danh ((di cua) or (dieu cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((xa hoi) OR (o hoc)). hieu van cau xuc va danh ((di cua) OR (dieu cua)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((xa hoi) or (o hoc)). hieu van cau xuc va danh ((di cua) or (dieu cua)) viet*.