Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoc » co hoc, cho hoc, chat hoc
xuc ban » duc ban, cuc ban, quoc ban
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac

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 cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban hanh tai cua tre*.