Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
tam luoc » tom luoc, dai luoc, tam hoc
luoc can » luc canh, hoc can, luoc dai
can benh » cac benh, san benh, con benh
benh kho » benh khong, benh phoi, benh hoc
te sach » toc sach
van tam » van tham, van tai, van tan
kho cua » khoe cua, khi cua, cho cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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)) ky nang x hoi. hieu van tam luoc can benh kho cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ky nang x hoi. hieu van tam luoc can benh kho cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ky nang x hoi. hieu van tam luoc can benh kho cua te*.