Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
vien cac » vien bach, vien dai, vien da
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
cao hoc » co hoc, cho hoc, chat hoc
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) or (thu sach)) ky nang cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang cao hoc. hieu ((ve cac) OR (vien cac)) xuc ban thanh tai cua tre*.