Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dat » thanh san, thanh hai, thanh van
su sach » vu sach
so sach » so sanh, bo sach, co sach
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
dac ban » cac ban, dac san, duc ban
dat cua » dai cua, day cua, mat cua
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: ((su sach) or (so sach)) ky nang x ho. hieu ((van bac) or (van hac)) dac ban thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang x ho. hieu ((van bac) OR (van hac)) dac ban thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang x ho. hieu ((van bac) or (van hac)) dac ban thanh dat cua tre*.