Perhaps you should try some spelling variations:
van nhanh » van thanh, van khanh, van nhan
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
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 nhanh) 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 nhanh) OR (van hanh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang ro hai. hieu van cac xuc ((van nhanh) 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 nhanh) or (van hanh)) tri cua tre*.