Perhaps you should try some spelling variations:
ban thuc » ban thuoc, dan thuc, van thuc
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
van tai » von tai, van tuan
thuc va » thuc vat, thuc dan, thuc day
thi van » thi lan, thi hanh, thi nang
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
o lang » hoa lang, hoi lang
v lang » va lang, _ lang, van lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((v lang) OR (o lang)) ha hoi. thi van ban thuc va ((hanh tai) or (van tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v lang) OR (o lang)) ha hoi. thi van ban thuc va ((hanh tai) OR (van tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v lang) OR (o lang)) ha hoi. thi van ban thuc va ((hanh tai) or (van tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v lang) OR (o lang)) ha hoi. thi van ban thuc va ((hanh tai) or (van tai)) cua tre*.