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
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va dao, va bao
va cuu » va cau, va chu, va huu
va co » vo co

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 xa hoi. hieu ((va cao) OR (va co)) thuc va hanh va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang xa hoi. hieu ((va cao) OR (va co)) thuc va hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu ((va cao) OR (va co)) thuc va hanh va cuu tre*.