Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
nam thuc » nam thuoc, am thuc, nam thu
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, dang xay
ang xa » lang xa, mang xa, dang xay
va nam » van nam, ha nam, va nay
cua tu » cua tuc, cua cu, cua te
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((xang xa) or (ang xa)) hoi. lieu va nam thuc vat thanh vi ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((xang xa) OR (ang xa)) hoi. lieu va nam thuc vat thanh vi ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((xang xa) or (ang xa)) hoi. lieu va nam thuc vat thanh vi ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((xang xa) or (ang xa)) hoi. lieu va nam thuc vat thanh vi ((cua tu) OR (cua su))*.