Perhaps you should try some spelling variations:
van nhanh » van thanh, van khanh, van nhan
thai cuu » thai cua, tai cuc, thi cuc
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
co hai » co dai, co hoi, so hai
ve cac » va cac, vien cac
o hai » so hai, o lai, _ hai

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 ty nang ((o hai) or (co hai)). hieu ve cac xuc ((van nhanh) or (van hanh)) thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o hai) OR (co hai)). hieu ve cac xuc ((van nhanh) OR (van hanh)) thai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((o hai) or (co hai)). hieu ve cac xuc ((van nhanh) or (van hanh)) thai cuu tre*.