Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
cham doc » cham soc, chat doc, chau doc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
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 thieu nang x hoi. ((hieu ve) or (hieu va)) cham doc ((va hanh) OR (van hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thieu nang x hoi. ((hieu ve) OR (hieu va)) cham doc ((va hanh) OR (van hanh)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thieu nang x hoi. ((hieu ve) or (hieu va)) cham doc ((va hanh) OR (van hanh)) dai cua tre*".