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
cau tre » cau tren, cau treo, cau tra
va cao » va cac, va co, va dao
va cau » van cau, va cac, va dau
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 cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang x hoi. hieu va cao ((thuc va) OR (thuc vat)) hanh va cau 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 cau tre*.