Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
dang van » hoang van, hang va
hanh va » hang va, hanh vi
thu dan » thu dang, thu ban, thu san
sach ky » sach y, sach ty, sach kem
van hoe » van hoa, van hoc, van hieu
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sac ky)) dang van hoe. hieu van nam ((thu dan) OR (thuc dan)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) dang van hoe. hieu van nam ((thu dan) OR (thuc dan)) hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) dang van hoe. hieu van nam ((thu dan) OR (thuc dan)) hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) dang van hoe. hieu van nam ((thu dan) OR (thuc dan)) hanh va cua tre*.