Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
hoa lang » hoa dan, hoa van
hoi cua » hoi chuc
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
o lang » hoi lang
cua te » cua tu

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