Perhaps you should try some spelling variations:
xach tay » canh tay
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
lang ha » long ha
thuc ca » thuc cua, thuc can, thuc cao
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
van am » van nam, van lam, van dam
ca dan » cac dan, ca dao
dan va » doan va, dan ca, ban va
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: toc ((xach tay) or (sach thu)) lang ha hoi. hieu van am thuc ca dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((xach tay) OR (sach thu)) lang ha hoi. hieu van am thuc ca dan va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((xach tay) or (sach thu)) lang ha hoi. hieu van am thuc ca dan va cua tre*.