Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
can thuc » dan thuc, van thuc, cay thuc
te sach » toc sach
hanh va » hang va, hanh vi
chu tre » cho tre, chu tri, cuu tre
tu nang » tru nang, tu nong, tu nano
hieu va » lieu va
va chu » va che, va cau, va chi
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 ((tu nang) or (truc nano)) x hoi. ((hieu va) or (hieu qua)) can thuc dan hanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (truc nano)) x hoi. ((hieu va) OR (hieu qua)) can thuc dan hanh va chu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (truc nano)) x hoi. ((hieu va) or (hieu qua)) can thuc dan hanh va chu tre*.