Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
thuc va » thuc vat, thuc day
sach ty » sach y, sach tu, sach thu
cua te » cua tu
va cam » va cham, va cac, va cao

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 ty xang xa hoi. hieu va cam ((thuc va) OR (thuc dan)) hanh di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. hieu va cam ((thuc va) OR (thuc dan)) hanh di ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang xa hoi. hieu va cam ((thuc va) OR (thuc dan)) hanh di ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu va cam ((thuc va) OR (thuc dan)) hanh di ((cua tre) or (cua te))*.