Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
hoang van » hang va
cac thuc » cach thuc, cac thu, can thuc
tang van » dang van, trong van, tang luan
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cuu 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: su sach ky ((tang van) or (hoang van)) hoc. hieu va cac thuc va danh dien ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang van) OR (hoang van)) hoc. hieu va cac thuc va danh dien ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((tang van) or (hoang van)) hoc. hieu va cac thuc va danh dien ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((tang van) or (hoang van)) hoc. hieu va cac thuc va danh dien ((cua tre) OR (cuu tre))*.