Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dang van » hoang van, hang va
hanh va » hang va, hanh vi
thuc va » thuc dan, thuc day
van hoe » van hoa, van hoc, van hieu
cua tre » cua te, cuu tre, cua triet
sai ky » sac 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 y) or (sai ky)) dang van hoe. hieu van nam ((thuc va) OR (thuc vat)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach y) OR (sai ky)) dang van hoe. hieu van nam ((thuc va) OR (thuc vat)) hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach y) or (sai ky)) dang van hoe. hieu van nam ((thuc va) OR (thuc vat)) hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sai ky)) dang van hoe. hieu van nam ((thuc va) OR (thuc vat)) hanh va cua tre*.