Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
van cap » van cau, van dap, van ca
cuu ban » cuu van, cua ban, cuu san
doi cua » dai cua, hoi 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: ((te sach) or (doc sach)) ((kho tang) or (ky nang)) xa hoi. hieu van cap cuu ban hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ((kho tang) OR (ky nang)) xa hoi. hieu van cap cuu ban hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ((kho tang) or (ky nang)) xa hoi. hieu van cap cuu ban hanh doi cua tre*.