Perhaps you should try some spelling variations:
hanh va » hang va, hanh vi
thuc va » thuc dan, thuc day
sach tu » sach thu, cach tu, sach uu
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach thu, xach tay
va cuu » va cau, va chu, va huu
va cao » va cac, va co, va dao

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) OR (sach ty)) nang xa hoi. hieu va cao ((thuc va) or (thuc vat)) hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach ty)) nang xa 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) OR (sach ty)) nang xa hoi. hieu va cao ((thuc va) or (thuc vat)) hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) OR (sach ty)) nang xa hoi. hieu va cao ((thuc va) or (thuc vat)) hanh va cuu tre*.