Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
hanh dao » lanh dao, thanh dat, thanh dam
sang tao » hang tai
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
va cham » va tham
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet

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 duoc ((nang ma) or (sang tao)) hoi. hieu ((va cham) OR (va chat)) duc va hanh dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach duoc ((nang ma) OR (sang tao)) hoi. hieu ((va cham) OR (va chat)) duc va hanh dao cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach duoc ((nang ma) or (sang tao)) hoi. hieu ((va cham) OR (va chat)) duc va hanh dao cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach duoc ((nang ma) or (sang tao)) hoi. hieu ((va cham) OR (va chat)) duc va hanh dao cua tre*.