Perhaps you should try some spelling variations:
te sach » toc sach
tu nang » tru nang, tu nong, tu lang
tu nano » truc nano
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu
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 cao tuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nano)) x hoi. hieu va cao tuc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tu nano)) x hoi. hieu va cao tuc va hanh vi cuu tre*.