Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang 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
di cua » dai cua, doi cua, de 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)) hanh di 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)) hanh di 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)) hanh di cua tre*.