Perhaps you should try some spelling variations:
cao khoa » lao khoa, bao khoa, cac khoa
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
hanh ve » hanh vi, hanh va, hanh kem
xuc ban » duc ban, cuc ban, quoc ban
cao xuc » cam xuc, cao duc, cao suc
cao hoa » cao hoat, cau hoa, cao hoc
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang ((cao hoa) OR (cao khoa)). lieu va cao xuc ban hanh ve ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ((cao hoa) OR (cao khoa)). lieu va cao xuc ban hanh ve ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ((cao hoa) OR (cao khoa)). lieu va cao xuc ban hanh ve ((cua tre) or (cuu tre))*".