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

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