Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh doi » thanh loi, thanh moi, thanh do
toc sach » hoc sach, doc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
hoa lang » hoa dan, hoa van
doi cua » dai cua, hoi cua
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
o lang » hoi lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (thuoc sach)) ((o lang) or (hoa lang)) xa hoi. hieu ve nam thuc va thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ((o lang) OR (hoa lang)) xa hoi. hieu ve nam thuc va thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ((o lang) or (hoa lang)) xa hoi. hieu ve nam thuc va thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ((o lang) or (hoa lang)) xa hoi. hieu ve nam thuc va thanh doi cua tre*.