Perhaps you should try some spelling variations:
hoang van » hang va
giang van » dang van, gian dan, giang day
day danh » day manh, dai danh, dao danh
thuc day » thuc dan, thuc vat
cac thuc » cach thuc, cac thu, can thuc
danh di » danh du, xanh di, danh dien
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
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: tu ((sach ky) OR (sac ky)) ((giang van) or (hoang van)) hoc. hieu ve cac thuc day danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((giang van) OR (hoang van)) hoc. hieu ve cac thuc day danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) ((giang van) or (hoang van)) hoc. hieu ve cac thuc day danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) ((giang van) or (hoang van)) hoc. hieu ve cac thuc day danh di cua tre*.