Perhaps you should try some spelling variations:
su sach » so sach, vu sach
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 cam » va cham, va cac, va cao
xuc va » duc va, tuc va, xac va
luc va » duc 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: ((su sach) or (do sanh)) ky nang xa hoi. hieu va cam ((xuc va) OR (luc va)) danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (do sanh)) ky nang xa hoi. hieu va cam ((xuc va) OR (luc va)) danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (do sanh)) ky nang xa hoi. hieu va cam ((xuc va) OR (luc va)) danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (do sanh)) ky nang xa hoi. hieu va cam ((xuc va) OR (luc va)) danh vi cua tre*.