Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ly hoang » ly hang, le hoang, ly hong
hoang xa » hoang ha, hoang va, hoang xuan
dinh tri » chinh tri
thi nang » thi cong, ki nang, thi hanh
cuu tre » cau tren, cau treo
va dinh » van dinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
cua tre » cua te, cua triet, dua tren

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 ly hoang xa hoi. ((hieu va) or (thi nang)) nam thuc va dinh tri ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly hoang xa hoi. ((hieu va) OR (thi nang)) nam thuc va dinh tri ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ly hoang xa hoi. ((hieu va) or (thi nang)) nam thuc va dinh tri ((cuu tre) or (cua tre))*.