Perhaps you should try some spelling variations:
dang xay » dang van, van xay
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
dau thuc » dan thuc, dai thuc, dam thuc
hanh di » hanh vi, hanh de, hang di
su sach » so sach
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
va dau » va dao
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) thu ((nang xa) or (dang xay)) hoi. lieu va dau thuc dan hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) thu ((nang xa) OR (dang xay)) hoi. lieu va dau thuc dan hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) thu ((nang xa) or (dang xay)) hoi. lieu va dau thuc dan hanh di cua tre*".