Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
dung ha » dung va, dung he, dung khoa
ky dung » ly dung, ky dang, ky vung
hieu va » lieu va, hieu qua
ha hoi » hoa hoi, ha noi, xa hoi
cac tu » cac thu, cach tu, cac du

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky dung ha hoi. hieu va cac tu va hanh vai ((va triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky dung ha hoi. hieu va cac tu va hanh vai ((va triet) OR (va trien))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky dung ha hoi. hieu va cac tu va hanh vai ((va triet) OR (va trien))*.