Perhaps you should try some spelling variations:
dieu cua » dieu tra
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
dau xuc » dau xac, dau xua, dau nuoc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
so hoc » co hoc, mo hoc, so hoa
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
va dau » va dao

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 ky nang ((xa hoi) or (so hoc)). hieu va dau xuc va danh ((di cua) or (dieu cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((xa hoi) OR (so hoc)). hieu va dau xuc va danh ((di cua) OR (dieu cua)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((xa hoi) or (so hoc)). hieu va dau xuc va danh ((di cua) or (dieu cua)) viet*.