Perhaps you should try some spelling variations:
sach tao » sach dao, sach bao, sach tai
nang cau » hang cau, nang dau, bang cau
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
cuc ban » cua ban, cac ban, cuu ban
cuu tre » cau tren, cau treo
cam cuc » cam xuc, cham cuu, pham cuc
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tao ((nang cau) OR (nang cao)) hoi. hieu va cam cuc ban hanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tao ((nang cau) OR (nang cao)) hoi. hieu va cam cuc ban hanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tao ((nang cau) OR (nang cao)) hoi. hieu va cam cuc ban hanh va ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach tao ((nang cau) OR (nang cao)) hoi. hieu va cam cuc ban hanh va ((cua tre) or (cuu tre))*.