Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
cau thuc » cau truc, cuu thuc, can thuc
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet

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