Perhaps you should try some spelling variations:
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va cac, va co, va dao
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 ma hoi. hieu va cao ((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 ma hoi. hieu va cao ((xuc va) OR (luc va)) danh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (do sanh)) ky nang ma hoi. hieu va cao ((xuc va) or (luc va)) danh vi cua tre*.