Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
ban hanh » ban hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
cuc tre » cua tre, cuu tre, cuc thue
duc tre » duoc tren, duc tien
y hang » ly hang, ty hang, yu hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: cuon sach y hang xa hoi. hieu va cac tuc ((va hanh) or (ban hanh)) tai ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cuon sach y hang xa hoi. hieu va cac tuc ((va hanh) OR (ban hanh)) tai ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "cuon sach y hang xa hoi. hieu va cac tuc ((va hanh) or (ban hanh)) tai ((cuc tre) OR (duc tre))".
• Adding a wildcard symbol may retrieve word variants: cuon sach y hang xa hoi. hieu va cac tuc ((va hanh) or (ban hanh)) tai ((cuc tre) OR (duc tre))*.