Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
luc va » tuc va, loc va
vi cua » vai cua, di cua

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 ky nang xa hoi. hieu va cau ((luc va) OR (duc va)) danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu va cau ((luc va) OR (duc va)) danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. hieu va cau ((luc va) OR (duc va)) danh vi cua tre*.