Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
san cua » sang cua, ban cua, dan cua
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: ((su sach) or (hoc sach)) ((ky tang) OR (ky nang)) van hoa. hieu va cam duc va thanh san cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) ((ky tang) OR (ky nang)) van hoa. hieu va cam duc va thanh san cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (hoc sach)) ((ky tang) OR (ky nang)) van hoa. hieu va cam duc va thanh san cua vat".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (hoc sach)) ((ky tang) OR (ky nang)) van hoa. hieu va cam duc va thanh san cua vat*.