Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ky trong » ly trong, ke trong, cay trong
trong xa » trong xay, trong ca, trong xu
va hanh » van hanh, va thanh, va danh
ve cao » va cao, ve bao, ve co
ve cac » va cac, vien cac
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 trong xa hoi. hieu ((ve cao) OR (ve cac)) 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 trong xa hoi. hieu ((ve cao) OR (ve cac)) 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 trong xa hoi. hieu ((ve cao) OR (ve cac)) duc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (thuoc sach)) ky trong xa hoi. hieu ((ve cao) OR (ve cac)) duc va hanh vi cua vat*.