Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, te sach, tu cach
van cac » van hac, van cau, van bac
nang ro » nang co, nang ho, nang ra
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ro hai » co hai, o hai, so hai
y nang » ky nang, ly nang, v nang

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) or (su sach)) y nang ro hai. hieu van cac xuc ((van thanh) or (van hanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang ro hai. hieu van cac xuc ((van thanh) OR (van hanh)) tri cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang ro hai. hieu van cac xuc ((van thanh) or (van hanh)) tri cua tre*.