Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
van cua » vang cua, ban cua, dan cua
cua te » cua tu

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 (thuoc sach)) ky nang x ho. hieu va cac lop ((va danh) OR (va hanh)) van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang x ho. hieu va cac lop ((va danh) OR (va hanh)) van cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang x ho. hieu va cac lop ((va danh) OR (va hanh)) van cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang x ho. hieu va cac lop ((va danh) OR (va hanh)) van cua te*.