Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ky long » ky cong, sy long, ky trong
long ha » dong ha, cong ha, dong hoa
va hanh » van hanh, va thanh, va danh
ha hoi » hoa hoi, ha noi, xa hoi
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (thuoc sach)) ky long ha hoi. hieu ((ve cao) OR (va cao)) duc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (thuoc sach)) ky long ha hoi. hieu ((ve cao) OR (va cao)) duc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (thuoc sach)) ky long ha hoi. hieu ((ve cao) OR (va cao)) duc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (thuoc sach)) ky long ha hoi. hieu ((ve cao) OR (va cao)) duc va hanh vi cua vat*.