Perhaps you should try some spelling variations:
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu va » lieu va, hieu qua
thuc va » thuc dan, thuc day
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao
va cuu » va cau, va chu, va huu
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 x hoi. hieu va cao ((thuc va) OR (thuc vat)) hanh va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang x hoi. hieu va cao ((thuc va) OR (thuc vat)) hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang x hoi. hieu va cao ((thuc va) OR (thuc vat)) hanh va cuu tre*.