Perhaps you should try some spelling variations:
dinh tai » dinh toai, dinh tri, dinh thi
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
cuc tre » duc tre, cua tre, cuu tre
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na

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 y ((nang xa) or (nang x)) hoi. hieu ((ve nam) OR (le nam)) thuc va dinh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. hieu ((ve nam) OR (le nam)) thuc va dinh tai cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (nang x)) hoi. hieu ((ve nam) OR (le nam)) thuc va dinh tai cuc tre*".