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
cuu tre » cua tre, cau tren, cau treo
hanh va » hang va, hanh vi
cu tren » tu tren, dua tren
hieu va » lieu va, hieu qua
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
va can » va chan, va cac, va cao
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 (tu nano)) x hoi. hieu va can thuc dan hanh va ((cuu tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nano)) x hoi. hieu va can thuc dan hanh va ((cuu tre) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nano)) x hoi. hieu va can thuc dan hanh va ((cuu tre) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tu nano)) x hoi. hieu va can thuc dan hanh va ((cuu tre) or (cu tren))*.