Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
van lam » van nam
tu sach » thu sach, te sach, tu cach
lang xa » lang ha, dang xay, lang van
ly lang » ly hang, ly vang, le lang
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo

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 (su sach)) ly lang xa hoi. hieu van lam thuc vat ((danh vi) or (dinh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ly lang xa hoi. hieu van lam thuc vat ((danh vi) OR (dinh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ly lang xa hoi. hieu van lam thuc vat ((danh vi) or (dinh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ly lang xa hoi. hieu van lam thuc vat ((danh vi) or (dinh vi)) cuu tre*.